CN104094151B

CN104094151B - Convergence optical system and projection display device

Info

Publication number: CN104094151B
Application number: CN201280068833.0A
Authority: CN
Inventors: 桑田宗晴; 诹访胜重; 小岛邦子
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2012-02-02
Filing date: 2012-09-20
Publication date: 2016-09-28
Anticipated expiration: 2032-09-20
Also published as: JPWO2013114665A1; US20140375958A1; TWI506300B; US9261765B2; JP5295468B1; CN104094151A; TW201333531A; DE112012005809T5; WO2013114665A1; DE112012005809B4

Abstract

Convergence optical system (1) has: face illuminating source (11), and it is from light-emitting area (12) radiating light；As the collimating lens (13) of collimating optical system, the light radiated from light-emitting area (12) is converted into almost parallel light by it；As the collecting lens (4) of convergence optical system, it assembles the light being converted into almost parallel light；And the integrating rod (8) as light intensity distributions uniformization element, it has the incident plane of incidence (81) by the light after collecting lens (4) convergence, and the light intensity distributions of incident illumination is carried out homogenization and penetrated from exit facet (82).In light on the plane of incidence (81) converging at integrating rod (8), the convergent angle of the light converging at the central part of the plane of incidence (81) is less than the convergent angle of the light in the corner converging at the plane of incidence (81).

Description

Convergence optical system and projection display device

Technical field

The present invention relates to convergence optical system and use the projection display device of this convergence optical system.

Background technology

In the past, the light source of projection display device mainly used lamp source.But, owing to lamp source has redness Amount of emitted light less, life-span shorter such shortcoming, therefore, in recent years, replace lamp source, use have longer The face illuminating sources such as the light emitting diode (LED) in life-span.Owing to the wave band of the light of monochromatic LED radiation is narrower, Therefore, by being applied in combination redness (R), green (G), the LED of blue (B), it is possible to realize wider face Color reproduction region.

Following lamp optical system is proposed: in order to improve the utilization ratio of light, use has in patent documentation 1 The LED of R, G, B of rectangle light-emitting area, makes any point from each light-emitting area put respectively by collimating optical system After the light penetrated becomes directional light, utilize dichroic mirror that it is synthesized, make synthesis light be focused at integration by collecting lens On the plane of incidence of rod.In this lamp optical system, the plane of incidence of integrating rod forms LED's with regulation multiplying power Light source image (picture of light-emitting area).

Further, in recent years, such as in the purposes of the display extremely grown crosswise such abnormity display, sometimes luminous The length-width ratio in face is different with the length-width ratio of the screen shape of display.In this case, light source is to having and light-emitting area The region of the image-displaying member of the length-width ratio that length-width ratio is different is illuminated, and produces light loss.

Therefore, patent documentation 2 proposes following structure: in the lamp optical system of projection display device In, by arranging the toric lens (toric lens) with ring (toroidal) face in the optical path, light source is sent out The length-width ratio of bright finish is changed.

Prior art literature

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 2009-300772 publication (the 0043rd～0050 section)

Patent documentation 2: Japanese Unexamined Patent Publication 2004-61848 publication (the 0046th～0052 section)

Summary of the invention

The problem that invention is to be solved

Here, in order to not produce light loss in the lamp optical system of projection display device, need to meet 2 conditions below.1st condition is to make the incident angle of light become to allow that incident angle (can effectively utilize in device The predetermined angular of light).2nd condition is to make light be focused in regulation illumination region.

In technology disclosed in patent documentation 1, the propagation (Etendue) at LED is far smaller than the expansion of integrating rod In the case of exhibition amount, it is focused at efficiently integrating rod from the light of LED radiation.But, aobvious in order to improve image In the case of showing that the lightness of element (illuminated body) makes more than the propagation that propagation is integrating rod of LED, When the size that the light source image imaging one-tenth making LED is identical with the plane of incidence of integrating rod, light is with more than allowing angle of incidence Angle incides the plane of incidence of integrating rod, produces light loss.

Further, in the case of the propagation of LED is less than the propagation of integrating rod, due to the aberration of collecting lens, The light source image of LED obscures at its periphery, therefore, and imaging the most significantly.If as a result of which it is, LED Light source image more than the plane of incidence of integrating rod, then produces light loss.

Further, in lamp optical system disclosed in patent documentation 2, it is possible to the length-width ratio of the light-emitting area of light source is carried out Conversion, is focused in the desired illumination region with different length-width ratio, but, by length-width ratio is changed, shine Convergence angle in bright changes according to the preservation rule of propagation.The preservation rule of propagation is available light source Long-pending constant such natural law of area and solid angle.

As an example, it is considered to set the length-width ratio of light-emitting area of light source (LED) as 4: 3, this length-width ratio is converted into 16: 9 and project to the situation on screen.In the structure of patent documentation 2, use the toric lens with anchor ring, Change imaging multiplying power and the imaging multiplying power in the direction parallel with optical axis in the direction vertical with optical axis.Thereby, it is possible to by 4: The length-width ratio of 3 is converted into the length-width ratio of 16: 9.Now, the short side direction of screen becomes and is compressed length-width ratio Direction.Further, compared with the light of the long side direction of screen, the convergence angle of the light of the short side direction of screen is bigger. Therefore, the incident angle of the light of the short side direction of screen (is allowed more than the predetermined angular that can effectively utilize in device Incident angle), there is the problem that light loss entirety will not reduce.

The present invention, precisely in order to solve above-mentioned problem and complete, its object is to, it is provided that a kind of convergence optical system and Use the projection display device of this convergence optical system, it is possible to reduce when the light of light source radiation is assembled Light loss and obtain higher light utilization ratio.Further, it is an object of the invention to, it is provided that a kind of collecting optics System and projection display device thereof, even if at length-width ratio and the light intensity distributions uniformization element of face illuminating source Or in the case of the length-width ratio difference of image-displaying member, it is also possible to reduce light loss.

For solving the means of problem

The convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, and it has Light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, the light radiated from light-emitting area is turned by it Change almost parallel light into；Having the convergent component of positive refractive power, it assembles the light being converted into almost parallel light；And Light intensity distributions uniformization element, it has the plane of incidence of the light after incidence is assembled, the light to incident illumination by convergent component Intensity distributions carries out homogenization and penetrates, on the plane of incidence converging at light intensity distributions uniformization element from exit facet In light, the convergent angle of the light converging at the central part of the plane of incidence is less than the convergent angle of the light in the corner converging at the plane of incidence.

Further, the convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, It has light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, it will radiate from light-emitting area Light be converted into almost parallel light；Having the convergent component of positive refractive power, it assembles the light being converted into almost parallel light； And light intensity distributions uniformization element, it has the plane of incidence of the light after incidence is assembled by convergent component, to incident illumination Light intensity distributions carry out homogenization and from exit facet penetrate, by the incidence converging at light intensity distributions uniformization element In the luminous point that light on face is formed, the luminous point of the central part being formed at the plane of incidence is more than the light in the corner being formed at the plane of incidence Point.

Further, the convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, It has light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, it will radiate from light-emitting area Light be converted into almost parallel light；Having the convergent component of positive refractive power, it assembles the light being converted into almost parallel light； And light intensity distributions uniformization element, it has the plane of incidence of the light after incidence is assembled by convergent component, to incident illumination Light intensity distributions carry out homogenization and penetrate from exit facet, from the light that the light-emitting area of face illuminating source is radiated, with Comparing from the light of the corner of light-emitting area radiation, the light radiated from the central part of light-emitting area is focused at farther away from convergent component Position.

Further, the convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, It has light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, it will radiate from light-emitting area Light be converted into almost parallel light；Having the convergent component of positive refractive power, it assembles the light being converted into almost parallel light； And light intensity distributions uniformization element, it has the plane of incidence of the light after incidence is assembled by convergent component, to incident illumination Light intensity distributions carry out homogenization and from exit facet penetrate, compared with the corner of the light-emitting area of face illuminating source, face is sent out The light-emitting area of radiant imaging multiplying power of imaging on the plane of incidence of light intensity distributions uniformization element is bigger at central part.

Further, the convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, It has light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, it will radiate from light-emitting area Light be converted into almost parallel light；And there is the convergent component of positive refractive power, it will be converted into almost parallel light Light converges to the display surface of image-displaying member, in the light on the display surface converging at image-displaying member, converges at The convergent angle of the light of the central part of display surface is less than the convergent angle of the light converging at corner.

Further, the convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, It has light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, it will radiate from light-emitting area Light be converted into almost parallel light；And there is the convergent component of positive refractive power, it will be converted into almost parallel light Light converges to the display surface of image-displaying member, the light that the light on by the display surface converging at image-displaying member is formed In point, the luminous point of the central part being formed at display surface is more than the luminous point in the corner being formed at display surface.

Further, the convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, It has light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, it will radiate from light-emitting area Light be converted into almost parallel light；And there is the convergent component of positive refractive power, it will be converted into almost parallel light Light converges to the display surface of image-displaying member, from the light that the light-emitting area of face illuminating source is radiated, and from light-emitting area The light of corner radiation compare, the light radiated from the central part of light-emitting area is focused at the position farther away from convergent component.

Further, the convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, It has light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, it will radiate from light-emitting area Light be converted into almost parallel light；And there is the convergent component of positive refractive power, it will be converted into almost parallel light Light converges to the display surface of image-displaying member, compared with the corner of the light-emitting area of face illuminating source, face illuminating source Light-emitting area imaging multiplying power of imaging on the display surface of image-displaying member is bigger at central part.

Further, the convergence optical system of the present invention is characterised by, this convergence optical system has: face illuminating source, It has light-emitting area, from light-emitting area radiating light；Having the collimating optical system of positive refractive power, it will radiate from light-emitting area Light be converted into almost parallel light；Having the convergent component of positive refractive power, it has the anchor ring of more than 2, assembles quilt It is converted into the light of almost parallel light；And light intensity distributions uniformization element, its have incident assembled by convergent component after The plane of incidence of light, the light intensity distributions of incident illumination is carried out homogenization and penetrates from exit facet, the length-width ratio of light-emitting area Different from the length-width ratio of the plane of incidence, in the light of the compression direction of the length-width ratio converged on the plane of incidence, converge at incidence The convergent angle of the light of the central part of the compression direction of the length-width ratio in face is less than the edge of the compression direction converging at length-width ratio The convergent angle of light.

Invention effect

In accordance with the invention it is possible to reduce light loss and improve light utilization ratio.Further, even if at face illuminating source In the case of length-width ratio is different from the length-width ratio of light intensity distributions uniformization element, it is also possible to reduce light intensity distributions uniform Change the light loss in element and improve light utilization ratio.

Accompanying drawing explanation

Fig. 1 is the base of the projection display device with convergence optical system illustrating embodiments of the present invention 1 The figure of this structure.

Fig. 2 is the figure of the structure of the convergence optical system illustrating reference example 1.

Fig. 3 is the figure of the structure of the convergence optical system illustrating reference example 1.

Fig. 4 is the figure of the structure of the convergence optical system illustrating embodiment 1.

Fig. 5 is the figure of the converged state on the plane of incidence of the integrating rod in the convergence optical system illustrating embodiment 1.

Fig. 6 is convergence optical system (A) and the convergence optical system (B) of embodiment 1 of comparative examples The figure of luminous point on the plane of incidence being formed at integrating rod is shown.

Fig. 7 is the figure of the imaging size in the plane of incidence of the integrating rod schematically illustrating embodiment 1.

Fig. 8 is an example and the converged state thereof of the shape of the collecting lens of the convergence optical system illustrating embodiment 1 Figure.

Fig. 9 is an example and the figure of converged state thereof of the shape of the collecting lens of the convergence optical system illustrating variation.

Figure 10 is the figure of the concrete structure illustrating the convergence optical system corresponding with the numerical example 1 of embodiment 1.

Figure 11 is the figure of the shape illustrating the collecting lens corresponding with the numerical example 1 of embodiment 1.

Figure 12 is the incidence of the integrating rod illustrating the convergence optical system corresponding with the numerical example 1 of embodiment 1 The figure of the luminous point on face.

Figure 13 is that the relative image height illustrating the convergence optical system corresponding with the numerical example 1 of embodiment 1 is with long-pending The figure of the relation between incoming position on point rod.

(A) and (B) of Figure 14 is to be shown in the convergence optical system of embodiment 1, does not enters integrating rod Penetrate the figure of Illumination Distribution on the plane of incidence in the case of the convergent angle on face arranges restriction.

(A) and (B) of Figure 15 is to be shown in the convergence optical system of embodiment 1, by the incidence of integrating rod Convergent angle on face is limited in the Illumination Distribution on the plane of incidence allowed in the case of angle of incidence that is 30 degree (half-angle) Figure.

(A) and (B) of Figure 16 is the curve chart that contrast illustrates Illumination Distribution corresponding with Figure 14 and Figure 15 respectively.

Figure 17 be face illuminating source is shown join photodistributed figure.

Figure 18 is the figure of the structure of the convergence optical system illustrating comparative example.

Figure 19 is the figure of the luminous point on the plane of incidence of the integrating rod of the convergence optical system illustrating comparative example.

Figure 20 is the projection display device with convergence optical system illustrating embodiments of the present invention 2 The figure of basic structure.

Figure 21 is convergence optical system and the projection display device roughly illustrating embodiments of the present invention 3 The structure chart of structure.

(A) and (B) of Figure 22 is the schematic diagram of the structure of the convergence optical system illustrating reference example 2.

Figure 23 is the schematic diagram of the zone of convergence in the plane of incidence of the integrating rod illustrating reference example 2.

(A) and (B) of Figure 24 is the schematic diagram of the structure of the convergence optical system illustrating reference example 3.

Figure 25 is the schematic diagram of the zone of convergence in the plane of incidence of the integrating rod illustrating reference example 3.

(A) and (B) of Figure 26 is the figure of the structure of the convergence optical system illustrating embodiments of the present invention 3.

Figure 27 is the schematic diagram of the converged state in the convergence optical system illustrating embodiment 3.

Figure 28 is the image formation state of the light radiated from the small light-emitting zone of convergence optical system illustrating embodiment 3 Schematic diagram.

(A) and (B) of Figure 29 is that the convergence F value of the convergence optical system illustrating embodiment 3 controls lens The schematic diagram of converged state.

(A) and (B) of Figure 30 is the figure of the structure illustrating the convergence optical system corresponding with numerical example 2.

Figure 31 is the convergent point on the plane of incidence of the integrating rod illustrating the convergence optical system corresponding with numerical example 2 Figure.

Figure 32 is the figure of the radial location illustrating the light from light-emitting area radiation.

Figure 33 is the structure chart of the structure illustrating the convergence optical system corresponding with comparative example 2.

Figure 34 is the figure of the convergent point on the plane of incidence of the integrating rod illustrating the convergence optical system corresponding with comparative example 2.

Figure 35 is the structure of convergence optical system and the projection display device illustrating embodiments of the present invention 4 Figure.

(A) and (B) of Figure 36 is the integrating rod of the taper illustrating embodiment 4 with the contrast of general integrating rod The explanatory diagram of shape.

(A) and (B) of Figure 37 is the plane of incidence of the integrating rod of the convergence optical system for embodiment 4 is described On the figure of zone of convergence.

(A) and (B) of Figure 38 is the structure of the integrating rod illustrating embodiment 4 with the contrast of general integrating rod Axonometric chart.

(A) and (B) of Figure 39 is the structure chart of the structure of the convergence optical system illustrating numerical example 2.

Figure 40 is the figure of the convergent point on the plane of incidence of the integrating rod of the convergence optical system illustrating numerical example 3.

Figure 41 is that the angle of the light in the plane of incidence of the integrating rod of the convergence optical system illustrating embodiment 4 relies on The figure of property.

Detailed description of the invention

Embodiment 1

Fig. 1 is the projection display device with convergence optical system 1A illustrating embodiments of the present invention 1 The figure of the basic structure of 2A.The convergence optical system 1A of embodiment 1 have red (R) wave band of radiation light (with Be down red light) redness face illuminating source 11r, the light (below for green light) of green (G) wave band of radiation Green face illuminating source 11g, the blueness face of light (below for blue light) of blue (B) wave band of radiation sends out Radiant 11b.

In FIG, single dotted broken line represents red (R) light, and long dotted line represents green (G) light, and short dash line represents Blue (B) light.

Face illuminating source 11r has light-emitting area 12r of radiation red light.Further, illuminating source 11g in face has radiation Light-emitting area 12g of green light, face illuminating source 11b has light-emitting area 12b of radiation blue light.Light-emitting area 12r, 12g, 12b is the plane of mutually the same rectangular shape and formed objects.

Face illuminating source 11r, 11g, 11b can by LED (light emitting diode), EL (electroluminescent) element, Semiconductor laser and combinations thereof are constituted, but, below the situation using LED is illustrated.

Convergence optical system 1A is also light-emitting area 12r of face illuminating source 11r, 11g, 11b, the penetrating of 12g, 12b Go out side and possess collimating lens (collimating optical system) 13r, 13g, the 13b with positive refractive power respectively.

The red light radiated from redness light-emitting area 12r is converted into almost parallel light (directional light by collimating lens 13r Change).The green light radiated from green light-emitting area 12g is converted into almost parallel light by collimating lens 13g.Collimation is thoroughly The blue light radiated from blueness light-emitting area 12b is converted into almost parallel light by mirror 13b.

Convergence optical system 1A also has light compositing unit, and this light compositing unit uses collimating lens 13r to through redness After red light, through green green light after collimating lens 13g, through blueness indigo plant after collimating lens 13b Coloured light synthesizes.Light compositing unit is such as by the cross dichroic mirror structure with perpendicular to one another 2 piece dichroic mirror 6,7 Become.Dichroic mirror 6,7 has the characteristic of the light of transmission or reflection specific band.In FIG, double dot dash line represents conjunction Light after one-tenth.

Preferably in 1, light compositing unit has the dichroic mirror of transmission green light and blue light reflection red light The dichroic mirror 7 of 6, transmission red light and green light reflection blue light.With the feelings being separated from each other 2 pieces of dichroic mirrors of configuration Condition is compared, and cross dichroic mirror can reduce the configuration space of mirror, therefore, it is possible to realize overall compact convergence optics System.It addition, light compositing unit is not limited to the structure shown in Fig. 1.

Convergence optical system 1A also has makes having of the light convergence after being synthesized by light compositing unit (dichroic mirror 6,7) The collecting lens (convergent component) 4 of positive refractive power and the intensity distributions of the light after being assembled by collecting lens 4 is entered The integrating rod 8 as light intensity distributions uniformization element of row homogenization.Integrating rod 8 has incident by collecting lens 4 The plane of incidence 81 of the light after convergence, injection carry out the exit facet 82 of the light after homogenization to light intensity distributions.

Collecting lens 4 incidence, by the light after dichroic mirror 6,7 synthesis, makes the light after this synthesis be focused at expected angle On the plane of incidence 81 of integrating rod 8.R, G, B light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, The plane of incidence 81 of 12b and integrating rod 8 becomes conjugate relation, is formed with light-emitting area on the plane of incidence 81 of integrating rod 8 The 2 secondary light source pictures of 12r, 12g, 12b.

Integrating rod 8 is made up of, the plane of incidence the transparent component (being glass here) of the quadrangular shape with square-section 81 have the rectangular shape similar to image-displaying member (illustrating in Fig. 1) with label 22.Incide integrating rod 8 The light of the plane of incidence 81 total reflection is repeated in the interface of glass with air and propagates inside integrating rod, Thus, the light of each color is homogenized, penetrates from exit facet 82.It addition, light intensity distributions uniformization element does not limits In integrating rod 8, it is also possible to be hollow light pipe or other element utilizing the total reflection at inner surface.

Projection display device 2A has the convergence optical system 1A of so composition, incidence from convergence optics The lamp optical system 21 of the light (light intensity distributions being carried out the light after homogenization by integrating rod 8) of system 1A injection, Light from lamp optical system 21 incidence is modulated and generates the image-displaying member 22 of image light, to by image The image light that display element 22 generates is amplified the projection optical system 24 of projection.There is the rear projection of screen In the case of the projection display device of formula, also there is the screen 25 that image light is amplified projection.

The light penetrated from integrating rod 8 is irradiated to image and shows by lamp optical system (also referred to as illumination optical device) 21 Show on the display surface (viewing area) 23 of element 22, such as, be made up of lens etc..

The exit facet 82 of integrating rod 8 and the display surface 23 of image-displaying member 22 become mutually conjugate relation, tool There is the display surface 23 as being imaged on image-displaying member 22 of the exit facet 82 of the integrating rod 8 of the rectangle of uniform luminance On.The display surface 23 of exit facet 82 with image-displaying member 22 by making integrating rod 8 becomes the most similar shape Shape, it is possible to efficiently the display surface 23 of image-displaying member 22 is illuminated, it is possible to obtain higher light and utilize effect Rate.

Image-displaying member 22 e.g. transmission-type or reflection type liquid crystal panel or reflective DMD (Digital Micro-Mirror Device).The display surface 23 of image-displaying member 22 has the knot of the multiple pixel of two-dimensional arrangements Structure.The light irradiated by lamp optical system 21, according to video signal, is entered by image-displaying member 22 according to each pixel Row intensity modulated, thus generates image light.

Light (image light) amplification after projection optical system 24 will be modulated by image-displaying member 22 projects to screen On 25.In the case of above projection (front projector), screen 25 uses reflective viewing screen, and observer observes Image based on reflection light.Overleaf in the case of projection (rear projector), screen 25 uses transmissive viewing screen, Observer views and admires image based on transmission light.The surface of screen 25 and the display surface 23 of image-displaying member 22 configure In mutually conjugate position.

In the projection display device 2A so constituted, display image as described below.That is, from face luminescence light Light-emitting area 12r of source 11r, 11g, 11b, red light, green light and the blue light TEM investigation of 12g, 12b radiation Collimating lens (collimating optical system) 13r, 13g, 13b and become almost parallel light, incide dichroic mirror 6,7 Synthesize.Light after being synthesized by dichroic mirror 6,7 is focused at the plane of incidence 81 of integrating rod 8 by collecting lens 4 On.Light after light intensity distributions being carried out homogenization by integrating rod 8 is irradiated to figure through lamp optical system 21 As display element 22, the image light after being modulated by image-displaying member 22 is put by projection optical system 24 Project to greatly, on screen 25, screen 25 show image.

Further, since image-displaying member 22 (illuminated body) is illuminated by convergence optical system 1A, therefore have Time be also referred to as illuminator.

Then, light-emitting area 12r of opposite illuminating source 11r, 11g, 11b, the size of 12g, 12b, integrating rod 8 The size of the plane of incidence 81, image-displaying member 22 display surface 23 size between relation carry out in further detail Explanation.In embodiment 1, light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b and long-pending The plane of incidence 81 dividing rod 8 becomes mutually conjugate relation, and, the exit facet 82 of integrating rod 8 and image display are first The display surface 23 of part 22 becomes mutually conjugate relation.

Generally, when designing convergence optical system and lamp optical system, it is considered to propagation (Etendue) Such amount.Convergence optical system 1A and projecting image that the concept of propagation is applied to embodiment 1 show During device 2A, about assuming to radiate from light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b The propagation (Es) of face illuminating source 11r, 11g, 11b when the luminous intensity distribution of light beam is distributed as lambertian distribution (completely diffusion), The propagation (Ei) of integrating rod 8 and the propagation (El) of image-displaying member 22, by light-emitting area or sensitive surface Area is long-pending, with below formula (1)～(3) with the solid angle of the light that light or the sensitive surface from light-emitting area radiation receives Represent.

Es=As × π × sin²(θs)···(1)

Ei=Ai × π × sin²(θi)···(2)

El=Al × π × sin²(θl)···(3)

In formula (1), Es is the propagation of face illuminating source 11r, 11g, 11b.As be face illuminating source 11r, Light-emitting area 12r of 11g, 11b, the area of 12g, 12b.θ s is the luminescence from face illuminating source 11r, 11g, 11b In face 12r, 12g, 12b radiation the light that will be taken into by collimating lens 13r, 13g, 13b with largest extension The ray relative of angle radiation is in light-emitting area 12r, the angle (being taken into angle) of the normal of 12g, 12b.π is pi.

In formula (2), Ei is the propagation of integrating rod 8.Ai is the area of the plane of incidence 81 of integrating rod 8.θi It is to radiate with the above-mentioned angle that is taken into from light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b and incide The ray relative of the plane of incidence 81 of integrating rod 8 is in the angle (convergent angle) of the normal of the plane of incidence 81 of integrating rod 8.

In formula (3), El is the propagation of image-displaying member 22.Al is the display surface of image-displaying member 22 The area of 23.θ l is to incide image-displaying member 22 after the plane of incidence 81 inciding integrating rod 8 with above-mentioned convergent angle The ray relative of display surface 23 in the angle (illumination angle) of the normal of display surface 23.

Generally, be designed to the value of above-mentioned Es, Ei, El with lamp optical system identical for convergence optical system. Such as, the size (transverse direction × longitudinal direction) of light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b For 3mm × 4mm (diagonal-size is 5mm), when set from light-emitting area 12r, 12g, 12b be hemispherical radiation (θ s=90 °) The luminous intensity distribution of light beam when being distributed as lambertian distribution, according to formula (1), calculated as described below illuminating source 11r, 11g, The propagation (Es) of 11b, becomes to be of about 37.7.

Es=As × π × sin²(θs)

=(3 × 4) × π × sin²(90°)

=12 × π ≈ 37.7

Correspondingly, if the size of the display surface 23 of image-displaying member 22 is 12mm × 16mm (diagonal-size 20mm), the F value of the light being illuminated the display surface 23 of image-displaying member 22 is being set as 2.0 Time (θ l ≈ 14.5 °), according to formula (3), the propagation (El) of image-displaying member 22 calculated as described below, become big About 37.7, can be identical with the propagation of face illuminating source 11r, 11g, 11b (Es).

El=Al × π × sin²(θl)

=(12 × 16) × π × sin²(14.5°)

≈192×π×0.0627≈37.7

Further, if the F value inciding the light of the plane of incidence 81 of integrating rod 8 is 1.0 (θ i=30 °), by integrating rod 8 When being dimensioned so as to 6mm × 8mm (diagonal-size 10mm) of the plane of incidence 81, according to formula (2), following institute State the propagation (Ei) calculating integrating rod 8, become to be of about 37.7, can be with face illuminating source 11r, 11g, 11b Propagation (Es) identical with the propagation of image-displaying member 22 (El) both sides.

Ei=Ai × π × sin²(θi)

=(6 × 8) × π × sin²(30°)

=48 × π × 0.25 ≈ 37.7

In the case of the above-described example, the optical system being made up of collimating lens 13r, 13g, 13b and collecting lens 4 Light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b (size: 3mm × 4mm) are enlarged into 2 Times and be imaged on the plane of incidence 81 (size: 6mm × 8mm) of integrating rod 8.Now, due to by collimating lens Aberration that the optical system that 13r, 13g, 13b and collecting lens 4 are constituted has and make LED light source image at its periphery Portion is fuzzy and in the case of imaging the most significantly or above-mentioned optical system imaging multiplying power relatively greatly and face illuminating source Light-emitting area 12r of 11r, 11g, 11b, the 2 secondary light source pictures of 12g, 12b form more than the plane of incidence 81 of integrating rod 8 In the case of Xiang, the also outside to the plane of incidence 81 of integrating rod 8 is irradiated light and (that is, is existed and do not incide the plane of incidence 81 Light), produce light loss.

On the other hand, when the multiplying power setting the optical system being made up of collimating lens 13r, 13g, 13b and collecting lens 4 During less than expected value, light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b 2 secondary light source pictures more Little, there is not the light in the outside of the plane of incidence 81 being irradiated to integrating rod 8.But, in the case of being somebody's turn to do, owing to inciding The convergent angle of the light of the plane of incidence 81 of integrating rod 8 increases, and therefore, incides the display surface of image-displaying member 22 The illumination angle of the light of 23 also increases, as a result of which it is, cause the maximization of light loss or projection optical system.

That is, convergence optical system 1A needs to make to be taken into the angle luminescence from face illuminating source 11r, 11g, 11b with regulation The light of face 12r, 12g, 12b radiation becomes given size with regulation convergent angle imaging, when exceeding this regulation convergent angle and chi Time very little, produce light loss etc..

But, it is contemplated that it is difficult to be taken into the whole light (θ s=90 °) from face illuminating source 11r, 11g, 11b radiation, and And in view of foozle and uniformity, when the display surface 23 of image-displaying member 22 is illuminated, aobvious with ratio Show that the slightly larger mode in face 23 is illuminated (illumination surplus) etc., thus, it practice, according to the specification of optical system, Suitably the size etc. of the plane of incidence 81 being taken into angle and integrating rod 8 is optimized.

When the propagation setting integrating rod 8 is identical with the propagation of image-displaying member 22 or becomes fixed relationship, as Upper described, in terms of the utilization ratio of light, most preferably make propagation and the integration of face illuminating source 11r, 11g, 11b The propagation of rod 8 is consistent.But, it practice, face illuminating source 11r, 11g, 11b and image-displaying member 22 Size and the choice of specification limited, it is not necessary to can make face illuminating source 11r, 11g, 11b propagation and The propagation of integrating rod 8 is consistent.

On the other hand, when the propagation being set as face illuminating source is less than the propagation of integrating rod, it is impossible to obtain image The maximum lightness that display element 22 is capable of, therefore, is in most cases set as the propagation of face illuminating source Propagation more than integrating rod.Further, even if being set as the propagation propagation less than integrating rod of face illuminating source, Also light loss can be produced when the aberration of convergence yoke is bigger.

So, be more than the propagation of integrating rod at the propagation being set as face illuminating source in the case of, it is impossible to expectation Convergent angle below angle is taken into the whole light from face illuminating source in integrating rod, produces light loss.Use figure This point is illustrated by the reference example 1 of 2 and Fig. 3.

As a reference example 1, Fig. 2 and Fig. 3 illustrate cannot with the convergent angle below expected angle be taken in integrating rod from Whole light of face illuminating source radiation and produce the structure in the case of light loss.For convenience of description, use with real The structural element of reference example 1 is illustrated by the label executing the structural element of mode 1 identical.

Specification (area and F value) according to image-displaying member 22 determines the size of the plane of incidence 81 of integrating rod 8. In the reference example 1 shown in Fig. 2, so that the imaging multiplying power equivalently-sized with the plane of incidence 81 of integrating rod 8, make Light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b imaging on the plane of incidence 81 of integrating rod 8. In the case of Gai, the light radiated from each point of light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b with More than allowing that the angle [alpha] of angle of incidence is focused on the plane of incidence 81 of integrating rod 8, therefore produce light loss.Should Light loss is referred to as the light loss caused due to angle.

It addition, allow that angle of incidence refers to become when the angle of incidence of the plane of incidence 81 that light incides integrating rod 8 increases again, The optical element that will not incide rear class from a part for the light of integrating rod 8 injection (is lamp optical system 21 here With projection optical system 24) the limit angle of incidence of state.

On the other hand, in the reference example 1 shown in Fig. 3, the light-emitting area from face illuminating source 11r, 11g, 11b is made The light of each point radiation of 12r, 12g, 12b is comprising the plane of incidence 81 of integrating rod 8 with the angle allowing below angle of incidence Plane on imaging, but, compared with Fig. 2, imaging multiplying power is bigger.Therefore, face illuminating source 11r, 11g, 11b Light-emitting area 12r, 12g, 12b 2 secondary light source pictures more than the size of the plane of incidence 81 of integrating rod 8, produce light quantity Loss.This loss is referred to as the light loss caused due to area.

Fig. 4 is the figure of the light path in the convergence optical system 1A illustrating embodiments of the present invention 1.Further, since The impact that convergence (convergence) state of the negligible light on radiating from face illuminating source 11r, 11g, 11b causes, because of This, omit dichroic mirror 6,7 here.The propagation of face illuminating source 11r, 11g, 11b is more than the extension of integrating rod 8 Amount, this is identical with reference example 1 (Fig. 2 and Fig. 3).

It addition, in the following description, as required, face illuminating source 11r, 11g, 11b are referred to as that " face is sent out Radiant 11 ".Further, light-emitting area 12r, 12g, 12b are referred to as " light-emitting area 12 ", by collimating lens 13r, 13g, 13b are referred to as " collimating lens 13 ".

Face illuminating source 11 propagation more than integrating rod 8 propagation in the case of, as it has been described above, produce by The light loss (Fig. 2) caused in angle, the light loss (Fig. 3) caused due to area or its both sides.? In embodiment 1, particularly reduce the light loss (Fig. 2) caused due to angle.

In the diagram, the light radiated from the corner (corner) of the light-emitting area 12 of face illuminating source 11 is with regulation angle of incidence Incide the corner of the plane of incidence 81 of integrating rod 8.On the other hand, from the light-emitting area 12 of face illuminating source 11 Centre portion radiation light with the incident angles less than the angle of incidence of the light radiated from the corner of light-emitting area 12 to integrating rod 8 The central part of the plane of incidence 81.

In other words, compared with the corner of the plane of incidence 81, the picture of the light-emitting area 12 of face illuminating source 11 is at integrating rod 8 The plane of incidence 81 on imaging time imaging multiplying power bigger at central part.

Fig. 5 is to illustrate that the light-emitting area 12 (12r, 12g, 12b) from face illuminating source 11 (11r, 11g, 11b) is put The light penetrated is focused at the enlarged drawing of the situation on integrating rod 8.Here, for convenience of description, if the incidence of integrating rod 8 The normal direction in face 81 is that horizontal direction illustrates.

From the light a little radiated to the lower direction of horizontal direction in the corner of the light-emitting area 12 of face illuminating source 11 in level The corner of the plane of incidence 81 being focused at integrating rod 8 upward above with angle u1 in direction.From face illuminating source 11 The light a little radiated to the upper direction of horizontal direction in the corner of light-emitting area 12 lower section in the horizontal direction is upwards with angle U2 is focused at the corner of the plane of incidence 81 of integrating rod 8.

Further, from the light a little radiated to the lower direction of horizontal direction of the central part of face illuminating source 11 in level side To the central part of the plane of incidence 81 being focused at integrating rod 8 upward above with angle v1.From face illuminating source 11 The light a little radiated to the upper direction of horizontal direction of central part lower section in the horizontal direction is upwards focused at angle v2 The central part of the plane of incidence 81 of integrating rod 8.

When set for integrating rod 8 when allowing that angle of incidence is respectively α in the vertical direction relative to horizontal direction, long-pending Dividing the corner of the plane of incidence 81 of rod 8, convergent angle u1, u2 are more than α, therefore, produce the light caused due to angle Amount loss.On the other hand, at the central part of the plane of incidence 81 of integrating rod, convergent angle v1, v2 are less than α, therefore, The light loss caused due to angle will not be produced.

As a result of which it is, compared with the reference example 1 shown in Fig. 2, it is possible to reduce the light-emitting area 12 from face illuminating source 11 The light loss caused due to angle of light of central part radiation.In the case of Gai, from face illuminating source 11 The convergent angle of the light of centre portion radiation is less than allowing angle of incidence, and closer to allowing angle of incidence, more can reduce light quantity and damage Lose.

It addition, preferably in 1, the plane of incidence 81 of 2 secondary light source pictures and integrating rod 8 equal sized, but It is not limited to this, it is also possible to somewhat increase the deformation of imaging multiplying power etc..

Fig. 6 illustrates formed, the plane of incidence of integrating rod 8 by the light radiated from the corner of face illuminating source and central part Luminous point on 81.(A) of Fig. 6 illustrates the plane of incidence 81 in the convergence optical system of the reference example 1 shown in Fig. 2 On luminous point, (B) of Fig. 6 illustrates the plane of incidence 81 in the convergence optical system of the embodiment 1 shown in Fig. 4 On luminous point.

As shown in (A) of Fig. 6, in the convergence optical system of reference example 1, it is formed at face illuminating source 11 The corner of light-emitting area 12 and the luminous point of central part the least (but, due to the aberration of convergence yoke, periphery Point is not focused at a bit strictly, how much thickens, therefore, there is also the plane of incidence not inciding integrating rod 8 The light of 81).On the other hand, in the convergence optical system of embodiment 1, as shown in (B) of Fig. 6, formed Luminous point in the corner of the light-emitting area 12 of face illuminating source 11 is less, but, the luminous point being formed at central part is bigger.

This is because, as it has been described above, compared with the light of the corner of the light-emitting area 12 from face illuminating source 11 radiation, increase The imaging multiplying power of the light radiated from the central part of light-emitting area 12 greatly, therefore, from the light meeting of the corner of light-emitting area 12 radiation Gather the plane of incidence 81 at integrating rod 8, on the other hand, be focused at from the light of the central part radiation of light-emitting area 12 and compare integration The plane of incidence 81 of rod 8 is by exit facet 82 side (away from the side of collecting lens 4) (Fig. 5).

In the corner of the plane of incidence 81 of integrating rod 8, when luminous point is bigger, one part exposes from the plane of incidence 81, because of This, produce the above-mentioned light loss caused due to area.On the other hand, in the plane of incidence 81 of integrating rod 8 Centre portion, even if luminous point is to increase to a certain degree, also will not expose from the plane of incidence 81.Therefore, will not produce due to face The light loss amassed and cause, it is possible to reduce the light loss caused due to angle.

Fig. 7 be the tiny area in the central part of the light-emitting area 12 illustrating face illuminating source 11 and corner as at integrating rod The schematic diagram of the state of imaging on the plane of incidence 81 of 8.

By collimating lens 13 and collecting lens 4, in the central part of the light-emitting area 12 of face illuminating source 11 and corner Tiny length Δ a in the plane of incidence 81 of integrating rod 8 respectively imaging become Δ c's (central part) and Δ p (corner) Length.Now, as it has been described above, compared with the convergent angle in the corner of the plane of incidence 81 of integrating rod 8, the meeting of central part Poly-angle is less, and therefore, compared with corner, the imaging multiplying power of central part is bigger.That is, Δ c is more than Δ p.

Fig. 8 is the figure of an example of the concrete shape illustrating collecting lens 4.Collecting lens 4 has incident luminous from face 1st face 41 of the light of light source 11 and injection are from the 2nd face 42 of the light of the 1st face 41 incidence.Collecting lens 4 is complete Body has positive refractive power, makes the light convergence in the 1st face 41 of inciding and penetrates from the 2nd face 42.1st face 41 has Convex shape.About the 2nd face 42, in the cross section of optical axis (center) comprising collecting lens 4, near central authorities 42a has concave, and periphery 42b has convex shape and aspherical shape.

From the light of the corner of the light-emitting area 12 of face illuminating source 11 radiation the 1st face 41 by astriction, Further by astriction in the periphery 42b (convex surface) in the 2nd face 42, it is focused on convergent point fp.This meeting Accumulation fp is located substantially on the plane of incidence 81 of integrating rod 8.

On the other hand, the light radiated from the central part of the light-emitting area 12 of face illuminating source 11 is subject to the 1st face 41 Astriction, but, 42a (concave surface) near the central authorities in the 2nd face 42, dissipated/astriction hardly And be focused on convergent point fc.This convergent point fc is positioned at and leans on exit facet 82 side (i.e. than the plane of incidence 81 of integrating rod 8 Side away from collecting lens 4).

According to this structure, it is possible to make the convergence angle of the central part of the plane of incidence 81 of integrating rod 8 be less than the meeting in corner Poly-angle.

It addition, here, near the central authorities in the 2nd face 42 of collecting lens 4,42a has approximation with above-mentioned convergent point fc The shape of the sphere centered by (from the convergent point of light of central part of light-emitting area 12 of face illuminating source 11), but It is not limited to this.

Fig. 9 illustrates the variation of the shape of collecting lens 4.In this variation, the 2nd face 43 of collecting lens 4 Central authorities near the concave of 43a be not substantially sphere, there is the 2nd face 42 of collecting lens 4 than Fig. 8 Curvature big for 42a near central authorities, or there is the discontinuous shape in center.In this example embodiment, at collecting lens 4 43a near central authorities, dramatically different, from face illuminating source 11 from the convergent point (f1, f2) of the light of each wavestrip The light of the central part of light-emitting area 12 does not have clear and definite convergent point.In the case of Gai, if light be to allow below angle of incidence Angle incide in the plane of incidence 81 of integrating rod 8, then be prevented from the reduction of light loss.

It addition, in the above description, by the face shape in the 2nd face 43 of collecting lens 4, the meeting making light is played The function that poly-angle is different with central part in the corner of the plane of incidence 81 of integrating rod 8, but it is not limited to this structure.

For example, it is also possible to make the face shape of the 1st face the 41 and the 2nd face 42 both sides of collecting lens 4 share the meeting making light The function that poly-angle is different with central part in the corner of the plane of incidence 81 of integrating rod 8.Or, it is also possible to utilize multiple Mirror constitutes collecting lens 4, makes the plurality of lens have this function.

Further, about the function that the convergent angle making light is different with central part in the corner of the plane of incidence 81 of integrating rod 8, As long as the entirety of the convergence optical system being made up of collimating lens 13 and collecting lens 4 can play this function, Only can also be played this function by collimating lens 13, or, it is also possible to by collimating lens 13 and collecting lens 4 both sides Play this function.

But, play the function that makes the convergent angle of light different with central part in the corner of the plane of incidence 81 of integrating rod 8 Mask has aspheric surface, for formed this aspheric cost than the cost forming sphere high in the case of, preferably by altogether Same-action is in the light (that is, use number is less) radiated from the face illuminating source 11 (11r, 11g, 11b) of each color Collecting lens 4 play this function.

Numerical example 1

Below, the numerical example 1 of the convergence optical system 1A of embodiment 1 is illustrated.Table 1 illustrates meeting The optical data of poly-optical system 1A.Figure 10 illustrates the structure of the convergence optical system of the optical data of table 1.

In the present embodiment, the size of the light-emitting area 12 (12r, 12g, 12b) of face illuminating source 11 is 4.16mm×2.6mm.The size of the plane of incidence 81 of integrating rod 8 is 6.08mm × 3.8mm.From face illuminating source The angle that is taken into of the light of 11 is 80 degree (half-angles).Allow that angle of incidence utilizes half-angle to be expressed as 30 degree for integrating rod 8 (i.e. F value 1.0).This was equivalent to F value 2.5 (about 11.5 degree (half-angle)) showing image-displaying member 22 Show that the region of the 15.2mm × 9.5mm on face 23 is illuminated.Further, about the luminous ripple of face illuminating source 11 Long, red (11b) is 623nm, and green (11g) is 526nm, and blue (11r) is 462nm.

[table 1]

In the numbering Si hurdle, face of the optical data shown in table 1, illustrate i-th corresponding to the label Si shown in Figure 10 The numbering in face.Numbering i is the natural number of more than 1.The face being set in the structural element near object side is the 1st, Numbering i increases towards image side.Object side is illuminating source 11r, 11g, 11b side, face.In numbering Si hurdle, face, if Light-emitting area 12r of face illuminating source, 12g, 12b are OBJ, if the plane of incidence of integrating rod 8 81 is IMA.CG It it is the bell glass of face illuminating source.

Further, in the radius of curvature R i hurdle of table 1, it is shown that the value of the radius of curvature of i-th from object side.? In interval D i hurdle, face, it is shown that i-th Si and i+1 face Si+1 interval on optical axis from object side.Curvature half The unit of the value of footpath Ri dough-making powder interval D i is millimeter (mm).It is shown respectively for d line in Nd, ν d hurdle (587.6nm) refractive index and the value of Abbe number.

In the interval, face of the S2 of table 1, (r), (g), (b) are respectively equivalent to redness, green, blue face are sent out Interval, face in the case of radiant.In order to the aberration between each color is corrected, if between the face of face S2 and face S3 It is divided into the different value according to each color.

Further, in Table 1, the mark " * " of the upper right side mark of face numbering represents that this lens face is aspherical shape. Here, S8, S9, S10, S11, S12 are aspherical shape.Table 2 illustrates aspherical surface data.

[table 2]

Face is numbered	S8	S9	S10	S11	S12
						k	-8.022716E-01	-2.44512E+03	-1.19044E+00	1.89839E+00	0
A1	0	0	0	0	0
						A2	0	0	0	0	2.582873E-01
A3	0	0	0	0	-1.455971E-01
						A4	-5.680631E-06	-1.748405E-05	-3.938850E-06	-1.078345E-05	3.232564E-02
A5	0	0	0	0	-3.530807E-03
						A6	4.538869E-08	6.726470E-09	3.247966E-10	8.854132E-07	1.803433E-04
A7	0	0	0	0	-2.341330E-06
						A8	-4.538019E-11	1.202274E-11	-5.310997E-12	-7.148446E-09	-7.555612E-08
A9	0	0	0	0	0
						A10	-1.236856E-13	1.266630E-14	3.509382E-14	3.135224E-11	0
A11	0	0	0	0	0
						A12	-2.594120E-16	0	0	-6.369895E-14	0
A13	0	0	0	0	0
						A14	1.771464E-18	0	0	4.978408E-17	0

As the aspherical surface data shown in table 2, record in the formula of the aspherical shape represented by below formula (4) Each coefficient k, the value of Ai.Z is that the aspheric surface amount of recess from the position that optical axis separates radius r (mm) is (deep Degree: mm).Coefficient k represents whose conic coefficient.Coefficient C represents the curvature at vertex of surface.Coefficient Ai represents i Secondary asphericity coefficient.

Z1 (r)=C r²/{1+(1-(1+k)·C²·r²)^1/2}+∑ Ai ri (i=1～n) ... (4)

It addition, the optical data shown in Tables 1 and 2 is merely used for the convergence optics in embodiment 1 is described One example of the function of system 1A.Such as, used here as non-spherical lens, but it is also possible to be replaced as multiple ball Face lens.Further, in addition to the glass material shown in table 1, it is possible to use each different with Abbe number of refractive index Plant glass material.

In table 1 and Figure 10, CG is the bell glass (parallel flat) of face illuminating source 11.Collimating lens 13 (13r, 13g, 13b) from face illuminating source 11 side towards integrating rod 8 side successively by the 1st collimating lens 113 (113r, 113g, 113b), the 2nd collimating lens 213 (213r, 213g, 213b) and the 3rd collimating lens 313 (313r, 313g, 313b) these 3 pieces of lens are constituted.Further, collecting lens 4 (Figure 10) from face illuminating source 12 side towards integrating rod 8 sides are made up of the 1st collecting lens the 114 and the 2nd these 2 pieces of lens of collecting lens 115 successively.

Figure 11 illustrates the details of the converged state on the shape of collecting lens 115 and integrating rod 8.Collecting lens Near the central authorities of the 2nd S12 of 115, there is concave, make the light-emitting area from face illuminating source 11 hardly The light convergent/divergent of the central part radiation of 12, on the other hand, its periphery has convex shape, by its positive dioptric Power and make the light convergence that the corner of the light-emitting area 12 from face illuminating source 11 radiates.As a result of which it is, compared with corner, Convergent angle on the plane of incidence 81 of integrating rod 8 is less at central part.

Figure 12 illustrates by from the corner of the light-emitting area 12 of face illuminating source 11 and central part and 4 limits of light-emitting area 12 The light of each midpoint radiation formed, luminous point on the plane of incidence 81 of integrating rod 8.Understand in addition to central part 8 luminous points are converged to less, but, the luminous point of central part spreads significantly.

Table 3 illustrates the relation between relative image height and the F value of light being focused on the plane of incidence 81 of integrating rod 8.Phase It is the image height obtained so that the distance from the center of the plane of incidence 81 of integrating rod 8 to corner is normalized to image height, The relative image height at center is 0, and the relative image height in corner is 1.

Owing to the convergent angle of the light on the plane of incidence 81 of integrating rod 8 is the least the closer to center, therefore, in table 3 may be used Knowing, relative image height is that F value time 0 (i.e. center) is maximum, there is relative image height the biggest (i.e. closer to corner) then The tendency that F value is the least.Such as, when relative image height is 0 (center), the meansigma methods of F value tangentially and radially is 1.016, on the other hand, when relative image height is 1 (corner), the meansigma methods of F value tangentially and radially is 0.710.

[table 3]

Image height relatively	Tangential F value	Radially F value	Average F value
				0	1.016	1.016	1.016
0.1	0.978	0.994	0.986
				0.2	0.863	0.947	0.905
0.3	0.767	0.903	0.835
				0.4	0.723	0.869	0.796
0.5	0.704	0.844	0.774
				0.6	0.697	0.827	0.762
0.7	0.699	0.816	0.757
				0.8	0.704	0.808	0.756
0.9	0.703	0.804	0.754
				1	0.618	0.803	0.710

Figure 13 is the curve illustrating the relation between the incoming position on the plane of incidence 81 of relative image height and integrating rod 8 Figure.Incoming position on the plane of incidence 81 of integrating rod 8 uses the distance between the center of the plane of incidence 81 to represent.Figure Curve m shown in 13 is the curve representing the relation between relative image height and the incoming position shown in table 3.The opposing party Face, the straight line n shown in Figure 13 is to represent relative image height and incoming position proportional (that is, multiplying power will not be due to relatively Image height and change) straight line.

That is, increasing (i.e. close to corner) along with relative image height, curve m and straight line n is substantially uniform.On the other hand, In the part that relative image height is less, curve m is positioned at above straight line n, therefore, it is known that at the center of the plane of incidence 81 Near, imaging multiplying power increases.

Figure 14 and Figure 15 illustrates the Illumination Distribution on the plane of incidence 81 of integrating rod 8.(A) of Figure 14 is to be shown in In the convergence optical system of embodiment 1, the convergent angle on the plane of incidence 81 of integrating rod 8 is not arranged restriction (i.e., Comprise the whole light being focused on the plane of incidence 81) in the case of the plane of incidence 81 on the figure of Illumination Distribution.Further, (B) of Figure 14 is to illustrate illumination (unit: the W/mm corresponding with Figure 14 (A)²) the figure of deviation.

(A) of Figure 15 is to be shown in the convergence optical system of embodiment 1, by the plane of incidence 81 of integrating rod 8 On convergent angle be constrained to allow that angle of incidence that is 30 degree (half-angle) are (that is, except being focused in the light on the plane of incidence 81 The light with more than 30 degree incidences of convergent angle beyond) in the case of the plane of incidence 81 on the figure of Illumination Distribution.Figure (B) of 15 is to illustrate illumination (unit: the W/mm corresponding with Figure 15 (A)²) the figure of deviation.

Further, (A) of Figure 16 is to illustrate that illumination corresponding with Figure 14 and Figure 15 respectively is divided with (B) of Figure 16 The curve chart of cloth.In figure 16, solid line represents the Illumination Distribution of X-direction (laterally), and dotted line represents that Y-direction is (vertical To) Illumination Distribution.Figure 17 be used herein illuminating source 11 be shown join photodistributed curve chart.At figure In 17, transverse axis represents that angle, the longitudinal axis represent activity.

In (A) of Figure 14, owing to imaging multiplying power is relatively big at central part, therefore, it is focused at the light of central part Density is less, and compared with corner, illumination is relatively low.In (A) of Figure 15, due in corner with more than allow into The light of the angle incidence of firing angle is restricted, and therefore, compared with (A) of Figure 14, the illumination in corner is relatively low.Separately On the one hand, at the central part of (A) of Figure 15, light is focused within allowing angle of incidence, therefore, be not provided with into (A) of Figure 14 that firing angle limits compares, and illumination has almost no change.As a result of which it is, the illumination in the plane of incidence 81 Distribution becomes substantially uniform Illumination Distribution as shown in (B) of Figure 15 and Figure 16.

It addition, it can be seen that the central part of the plane of incidence 81 is the brightest in (A) of Figure 14, but, this is with ash Colour scale display accompanying drawing, it practice, the central part of the plane of incidence 81 is the darkest.Further, understand according to (B) of Figure 14, Illumination in the plane of incidence 81 is 0.02～0.05W/mm²In such relative broad range, the deviation of illumination is bigger.

Further, understanding according to Figure 15 (B), the illumination in the plane of incidence 81 concentrates on the model narrower than (B) of Figure 14 In enclosing, the deviation of illumination is less.

According to this result, according to the numerical example 1 of embodiment 1, light divides to become substantially uniform illumination The mode of cloth is focused on the plane of incidence 81 of integrating rod 8.

Comparative example 1

Below, the comparative example 1 contrasted the convergence optical system 1A being used for embodiment 1 illustrates. In this comparative example 1, use and be configured to allow that light general from face illuminating source assembled by angle of incidence with integrating rod Convergence optical system.Table 4 illustrates the optical data of comparative example 1, and Figure 18 illustrates the structure of correspondence.

In this comparative example 1, the size of the light-emitting area 12 of face illuminating source 11 is 4.16mm × 2.6mm, integrating rod The size of the plane of incidence 81 of 8 is 6.08mm × 3.8mm.The angle that is taken into from the light of face illuminating source 11 is 80 degree (half-angle), the plane of incidence 81 of integrating rod 8 allows that angle of incidence is 30 degree (half-angles).This is equivalent to relative to figure As the display surface 23 of display element 22 with F value 2.5 (about 11.5 degree (half-angle)) to 15.2mm × 9.5mm's Region is illuminated.Further, about the emission wavelength of face illuminating source 11, red (11r) is 623nm, green (11g) being 526nm, blue (11b) is 462nm.Above specification and the numerical example of above-mentioned embodiment 1 1 is identical.

[table 4]

The token mode of table 4 is identical with table 1.In this comparative example 1, OBJ～S8 face and above-mentioned embodiment 1 Numerical example 1 (table 1) identical, different after S9.Table 5 illustrates aspherical surface data.

[table 5]

Face is numbered	S8	S9
			k	-8.022716E-01	-1.063184E+02
A1	0	0
			A2	0	0
A3	0	0
			A4	-5.680631E-06	-6.144635E-07
A5	0	0
			A6	4.538869E-08	-3.993256E-09
A7	0	0
			A8	-4.538019E-11	3.684179E-13
A9	0	0
			A10	-1.236856E-13	3.084971E-15
A11	0	0
			A12	-2.594120E-16	0
A13	0	0
			A14	1.771484E-18	0

As table 3, table 6 illustrates that relative image height (carries out normalizing with the distance from the center of face illuminating source to corner Change and the image height that obtains) and the F value of light being focused on integrating rod 8 between relation.In this comparative example 1, long-pending The convergent angle on the plane of incidence 81 of rod 8 is divided to be designed to roughly the same with corner at center, therefore, with relative image height Unrelated, F value substantially 1.

[table 6]

Image height relatively	Tangential F value	Radially F value	Average F value
				0	0.9894	0.9894	0.989
0.1	0.9884	0.989	0.989
				0.2	0.9855	0.9878	0.987
0.3	0.9803	0.9857	0.983
				0.4	0.9726	0.9828	0.978
0.5	0.9618	0.979	0.970
				0.6	0.9471	0.9741	0.961
0.7	0.9275	0.9681	0.948
				0.8	0.9017	0.961	0.931
0.9	0.8677	0.9525	0.910
				1	0.8232	0.9424	0.883

Figure 19 illustrates by from the corner of the light-emitting area 12 of face illuminating source 11 and central part and 4 limits of light-emitting area 12 The light of each midpoint radiation formed, luminous point on the plane of incidence 81 of integrating rod 8.In this comparative example 1, due to The propagation of face illuminating source 11 is more than the propagation of integrating rod 8, therefore, when by the plane of incidence 81 of integrating rod 8 Convergent angle when being set as allowing angle of incidence, do not produce the light loss caused due to angle, replace, due to Imaging multiplying power is relatively big, therefore, is focused at than integrating rod 8 from the light of the corner of the light-emitting area of face illuminating source 11 radiation Light-emitting area 8 corner in the outer part, produce the light loss that causes due to area.

In table 7, numerical example 1 contrast utilizing comparative example 1 and above-mentioned embodiment 1 is shown with having figure The convergence efficiency joined on the plane of incidence 81 of the integrating rod 8 in the case of photodistributed illuminating source 11 of 17 (sets Allow the situation that angle of incidence is 30 degree (half-angles)).

[table 7]

Project	Comparative example 1	Numerical example 1
			Convergence efficiency (allowing angle of incidence 30 degree) on the plane of incidence of integrating rod	55.19%	58.68%
Relative efficiency (comparative example=100%)	100%	106.32%

According to table 7, the convergence efficiency of comparative example 1 is 55.19%, on the other hand, and the numerical value of embodiment 1 The convergence efficiency of embodiment 1 is 58.68%, and light utilization ratio improves 6.32%.Further, since show according to image The size of element 22 and illumination F value suitably determine the size of integrating rod 8, thus, it is believed that incide integrating rod 8 Light arrive screen 25, except the loss in the illumination transmission loss of surplus, lens etc. and image-displaying member 22 with Outward, there is no light loss in principle.

As described above, at the convergence optical system 1A and projection display device 2A of embodiment 1 In, in the light on the plane of incidence 81 converging at light intensity distributions uniformization element (integrating rod 8), converge at into The convergent angle of the light penetrating the central part in face 81 is less than the convergent angle of the light in the corner converging at the plane of incidence 81.In other words, In the luminous point that light on by the plane of incidence 81 converging at integrating rod 8 is formed, it is formed at the central part of the plane of incidence 81 Luminous point is more than the luminous point in the corner being formed at the plane of incidence 81.The most in other words, in the light-emitting area from face illuminating source 11 In the light of 12 radiation, compared with the light radiated from the corner of light-emitting area 12, radiate from the central part of light-emitting area 12 Light is focused at the position farther away from collecting lens 4 (convergent component).The most in other words, with the corner of the plane of incidence 81 Comparing, the light-emitting area 12 of face illuminating source 11 is at the plane of incidence 81 of integrating rod 8 (light intensity distributions uniformization element) Imaging multiplying power during upper imaging is bigger at central part.

Therefore, in the case of the propagation at face illuminating source 11 is more than the propagation of integrating rod 8, it is also possible to reduce Light loss in integrating rod 8, improves light utilization ratio.

It addition, in embodiment 1, be the propagation propagation more than integrating rod 8 of face illuminating source 11, but It is to the invention is not restricted to this, it is also possible to be applied to the propagation propagation less than integrating rod 8 of face illuminating source 11 Situation.

Further, at least one lens (collecting lens 4) of convergence optical system have a following optical surface (the 2nd face 42): Compared with the light that the central part from light-emitting area 12 radiates, assemble the luminescence from face illuminating source 11 with higher refractive power The light of the corner radiation in face 12, therefore, it is possible to the convergent angle realizing being focused at the light of the central part of the plane of incidence 81 is less than It is focused at the structure of the convergent angle of the light in the corner of the plane of incidence 81.

Further, in the 2nd face 42 of collecting lens 4, act on from the light-emitting area 12 of face illuminating source 11 The part (central part) of the light of centre portion radiation, in concave, acts on the part (periphery) of the light radiated from corner In convex shape, therefore, it is possible to utilize simple structure to realize being focused at the convergence of the light of the central part of the plane of incidence 81 Angle is less than the structure of the convergent angle of the light in the corner being focused at the plane of incidence 81.

Further, there are multiple illuminating sources 11r, 11g, 11b, have to from these multiple illuminating source 11r, The light of 11g, 11b radiation carry out synthesizing and direct it to collecting lens 4 (convergence optical system) dichroic mirror 6, 7 (light compositing unit), therefore, in colored projection display device, it is possible to increase light utilization ratio.

It addition, in the above description, it is arranged to make green face illuminating source 11g opposed with collecting lens 4, makes Redness is used with blueness face illuminating source 11r, 11b towards the direction vertical with green face illuminating source 11g, but It is to the invention is not restricted to this structure.For example, it is also possible to be configured to make blueness face illuminating source 11b saturating with optically focused Mirror 4 is opposed, makes red using hang down towards with blueness face illuminating source 11b with green face illuminating source 11r, 11g Straight direction.Or, it is also possible to it is configured to make redness face illuminating source 11r opposed with collecting lens 4, makes green With with blueness face illuminating source 11g, 11b towards the direction vertical with redness face illuminating source 11r.

Further, in the above description, it is collecting lens 4 and collimating lens 13r, 13g, 13b show as 1 piece respectively Convex lens, but, the invention is not restricted to this form, it is also possible to according to being taken into the convergence optical system such as angle, multiplying power Specification, uses the lens of more than 2 pieces to constitute respectively.Further, collecting lens 4 and collimating lens 13r, 13g, 13b It is not limited to spherical lens, it is possible to use non-spherical lens and free-form surface lens etc..

And then, in the above description, illustrate the situation that light intensity distributions uniformization element is integrating rod, but, no It is limited to integrating rod, other light intensity distributions uniformization element such as session that such as can also use hollow.

Further, in the above description, it is to utilize dichroic mirror 6,7 to the face illuminating source from each color of R, G, B The light of 11r, 11g, 11b radiation synthesizes, but is not limited to dichroic mirror, such as, can also use colour splitting prism etc. Other light compositing unit.Further, the quantity of face illuminating source is not limited to 3.

Embodiment 2

Then, embodiments of the present invention 2 are illustrated.Figure 20 is roughly to illustrate embodiments of the present invention The figure of the structure of the projection display device 2B with convergence optical system 1B of 2.The convergence of embodiment 2 Optical system 1B does not have integrating rod 8 and lamp optical system 21, this point and the convergence optical system of embodiment 1 1A (Fig. 1) is different.

In above-mentioned embodiment 1, in the plane of incidence 81 of integrating rod 8, as shown in Figure 15 and Figure 16 (B), Obtain substantially uniform Illumination Distribution.

Therefore, preferably in 2, it not the homogenization utilizing integrating rod to carry out light intensity distributions, but transmission The light crossing collecting lens 4 is directly incident on the display surface 23 of image-displaying member 22, showing of image-displaying member 22 Show that the Illumination Distribution in face 23 becomes the substantially uniform Illumination Distribution shown in (B) of approximation Figure 15 and Figure 16 Distribution.

Collimating lens 13 and collecting lens 4 make light-emitting area 12 the showing at image-displaying member 22 of face illuminating source 11 Show imaging on face 23.Display surface 23 due to image-displaying member 22 is more than the plane of incidence 81 (Fig. 1) of integrating rod 8, Accordingly, it is considered to the size of the light-emitting area 12 of the size of display surface 23 of image-displaying member 22, face illuminating source 11 Imaging multiplying power is determined with suitable illumination surplus.

Further, in above-mentioned embodiment 1, it is that the angle of incidence of the central part of the plane of incidence 81 making integrating rod 8 is less than The angle of incidence in the corner of the plane of incidence 81, but, preferably in 2, it is the display making image-displaying member 22 The angle of incidence of the central part in face 23, less than the angle of incidence in the corner of display surface 23, is achieved in the reduction of light loss.

Further, preferably in 2, by the convergence of the light of the central part of the display surface 23 of image-displaying member 22 What angle was set in the display surface 23 of image-displaying member 22 allows below angle of incidence.Can say according in embodiment 1 The plane of incidence 81 of bright integrating rod 8 allow angle of incidence, it is considered to make integrating rod 8 exit facet 82 as image show Show imaging multiplying power during imaging on the display surface 23 of element 22, obtain this and allow angle of incidence.

As illustrate with reference to Fig. 8 and Fig. 9, collecting lens 4 has a following optical surface: with from light-emitting area 12 The light of central part radiation is compared, and the corner assembling the light-emitting area 12 from face illuminating source 11 with higher refractive power is radiated Light.

So, owing to being not provided with integrating rod 8, it is possible to reduce convergence optical system 1B and projection display device The manufacturing cost of 2B.Further, owing to there is not the reflection in integrating rod 8 or transmission loss, therefore, it is possible to further Reduce light loss.Further, owing to need not the configuration space of integrating rod 8, therefore, it is possible to realize the miniaturization of device. Other structure is identical with embodiment 1.

As described above, the convergence optical system 1B and projection display device 2B of embodiment 2 Being configured to, the convergent angle of the central part of the display surface 23 of image-displaying member 22 is less than the meeting in the corner of display surface 23 Poly-angle.In other words, the luminous point of central part of the display surface 23 of image-displaying member 22 it is formed at more than being formed at corner Luminous point.The most in other words, compared with the converged position of the light radiated from corner, radiate from the central part of light-emitting area 12 The converged position of light be located further away from the position of collecting lens 4 (convergent component).The most in other words, with display surface The corner of 23 is compared, light-emitting area 12 on the display surface 23 of image-displaying member 22 imaging multiplying power during imaging in Centre portion is bigger.

Owing to so constituting, therefore, even if at the propagation of face illuminating source 12 more than the expansion of image-displaying member 22 In the case of exhibition amount, it is also possible to reduce the light loss in image-displaying member 22, it is possible to realize higher light and utilize Efficiency.Further, owing to need not integrating rod, therefore, it is possible to reduce manufacturing cost, further, it is possible to realize the little of device Type.

Embodiment 2 plays following effect: in the display surface 23 of image-displaying member 22, allow Figure 15 and In the case of substantially uniform Illumination Distribution shown in (B) of Figure 16, it is achieved the miniaturization of device and manufacturing cost Reduction.

On the other hand, in the display surface 23 of image-displaying member 22, requiring (B) than Figure 15 and Figure 16 In the case of the more uniform Illumination Distribution of shown Illumination Distribution, integrating rod is used to fill the most as Embodiment 1 Ground is divided to carry out the homogenization of light intensity.

That is, in the case of contrast embodiment 1 and embodiment 2, with miniaturization and the fall of manufacturing cost of device Low so from the viewpoint of, embodiment 2 advantageously, from the viewpoint of showing that the illuminance uniformity of picture is so, Embodiment 1 is advantageously.

It addition, in embodiment 2, be the propagation display more than image-displaying member 22 of face illuminating source 11 The propagation in face 23, but, the invention is not restricted to this, it is also possible to the propagation being applied to face illuminating source 11 is less than The situation of the propagation of the display surface 23 of image-displaying member 22.

Embodiment 3

Then, embodiments of the present invention 3 are illustrated.Below, if perpendicular to one another 3 directions are x direction (laterally), y direction (longitudinally) and z direction (direction parallel with optical axis).

Figure 21 is the projecting image display dress with convergence optical system 1C illustrating embodiments of the present invention 3 Put the figure of the structure of 2C.As shown in figure 21, the convergence optical system 1C of embodiment 3 have face illuminating source 11r, 11g、11b.Face illuminating source 11r is from red (R) light of light-emitting area 12r radiation.Face illuminating source 11g is from luminescence Green (G) light of face 12g radiation.Face illuminating source 11b is from blue (B) light of light-emitting area 12b radiation.

In figure 21, single dotted broken line represents red (R) light, and long dotted line represents green (G) light, and short dash line represents Blue (B) light.

Face illuminating source 11r, 11g, 11b can be by LED, EL element, semiconductor laser or combinations thereof Deng composition.In the following description, the situation utilizing LED to constitute face illuminating source 11r, 11g, 11b is carried out Explanation.

Convergence optical system 1C also has collimating lens (collimating optical system) 13r, 13g, 13b.Collimating lens 13r, 13g, 13b are respectively provided with positive refractive power.Collimating lens 13r will radiate from light-emitting area 12r of face illuminating source 11r Red light be converted into almost parallel light.Collimating lens 13g is by from the light-emitting area 12g radiation of face illuminating source 11g Green light is converted into almost parallel light.The indigo plant that collimating lens 13b will radiate from light-emitting area 12b of face illuminating source 11b Coloured light is converted into almost parallel light.

Convergence optical system 1C also has light compositing unit.Light compositing unit is to through the redness after collimating lens 13r Light, through the green light after collimating lens 13g, synthesize through the blue light after collimating lens 13b.At figure In 21, double dot dash line represents the light after being synthesized by light compositing unit.

In the example shown in Figure 21, light compositing unit is cross dichroic mirror, has perpendicular to one another 2 piece dichroic mirror 6、7.Dichroic mirror 6,7 has the light of transmission specific band and reflects the characteristic of light of specific band.

Here, dichroic mirror 6 transmission green light and blue light reflection red light.Dichroic mirror 7 transmission red light and green Light reflection blue light.Compared with the situation being separated from each other 2 pieces of dichroic mirrors of configuration, cross dichroic mirror can reduce mirror Configuration space, therefore, it is possible to realize compact convergence optical system.It addition, the structure of light compositing unit is not limited to figure Structure shown in 21.

Convergence optical system 1C also has collecting lens 4, assembles F value control lens 5 and integrating rod 8.Optically focused is saturating Mirror 4 has positive refractive power, assembles the light after being synthesized by light compositing unit.

Assemble F value to control lens (convergent component) 5 there is the function being controlled convergence F value, have 2 with On anchor ring.It addition, anchor ring also comprises the face of cylinder.After convergence F value control lens 5 incidence is assembled by collecting lens 4 Light, this light is focused on the plane of incidence 81 of integrating rod 8 with expected angle.

Integrating rod 8 has the plane of incidence 81 and exit facet 82, has the function as light intensity distributions uniformization element. The light carrying out auto-convergence F value control lens 5 incides the plane of incidence 81.Penetrate from exit facet 82 and light intensity distributions is carried out Light after homogenization.

Collecting lens 4 is structure the most common in red light, green light and blue light.Further, the control of F value is assembled Lens 5 processed are also structures the most common in red light, green light and blue light.

The light after being synthesized assembled by dichroic mirror 6,7 by collecting lens 4.Assembling F value control lens 5 will be by collecting lens Light after 4 convergences is focused on the plane of incidence 81 of integrating rod 8 with expected angle.Now, the plane of incidence of integrating rod 8 81 become conjugate relation with light-emitting area 12r, 12g, 12b.That is, the plane of incidence 81 of integrating rod 8 is formed send out The 2 secondary light source pictures of bright finish 12r, 12g, 12b.It addition, light-emitting area 12r, 12g, 12b are formed objects respectively Rectangle plane.

Integrating rod 8 such as has the shape of the quadrangular that cross section is rectangle.Integrating rod 8 is such as made up of glass.Incident Face 81 has the shape similar to the display surface 23 of image-displaying member 22.Here, due to image-displaying member 22 For rectangle, therefore the plane of incidence 81 is rectangle.The light inciding the plane of incidence 81 enters repeatedly in the interface of glass with air Row total reflection is also propagated in the inside of integrating rod 8.By propagating in the inside of integrating rod 8, to each color Light carry out homogenization.Light after homogenization penetrates from exit facet 82.

It addition, light intensity distributions uniformization element is not limited to integrating rod 8.Light intensity distributions uniformization element can also be The light guide of the hollow of total reflection is utilized, it is also possible to be other element at inner surface.

As shown in figure 21, projection display device 2C have convergence optical system 1C, lamp optical system 21, Image-displaying member 22 and projection optical system 24.Further, at the projecting image of the back projection type with screen In the case of display device, also there is the screen 25 that image light is amplified projection.

Lamp optical system 21 is incided from the light of convergence optical system 1C injection.Penetrate from convergence optical system 1C Just by integrating rod 8, light intensity distributions carried out the light after homogenization.Lamp optical system 21 is such as by lens Constitute.Image-displaying member 22 is to being modulated through the light after lamp optical system 21 and generating image light.Image Just there is the light of the image information comprising still image and dynamic image.Projection optical system 24 will be shown by image The image light amplification that element 22 generates projects on screen 25.

The light penetrated from integrating rod 8 is irradiated to the display surface 23 of image-displaying member 22 by lamp optical system 21. Now, the exit facet 82 of integrating rod 8 becomes conjugate relation with the display surface 23 of image-displaying member 22.Therefore, Picture imaging on display surface 23 of exit facet 82.Exit facet 82 is the rectangular surfaces with uniform luminance.Exit facet 82 There is the shape similar to display surface 23.Thereby, it is possible to efficiently display surface 23 is illuminated, further, it is possible to Obtain higher light utilization ratio.

Image-displaying member 22 e.g. transmissive liquid crystal panel, reflection type liquid crystal panel or reflective DMD.Display Face 23 has the structure of the multiple pixel of two-dimensional arrangements.Image-displaying member 22 will be shone by lamp optical system 21 The light penetrated is converted into image light.Image-displaying member 22 is according to video signal, according to each pixel to by light optics The light that system 21 is irradiated carries out intensity modulated, thus generates image light.

Projection display device 2C display as described below image.Sending out from face illuminating source 11r, 11g, 11b Bright finish 12r, 12g, 12b radiation the collimating lens 13r of red light, green light and blue light TEM investigation, 13g, 13b and become almost parallel light.Dichroic mirror is passed through transmitted through the almost parallel light after collimating lens 13r, 13g, 13b 6,7 synthesize.Light after synthesis is assembled by collecting lens 4.Light after being assembled by collecting lens 4 passes through meeting Poly-F value controls lens 5 and is focused on the plane of incidence 81 of integrating rod 8.By integrating rod 8, light intensity distributions is carried out Light after homogenization incides lamp optical system 21.It is irradiated to image from the light of lamp optical system 21 injection show Element 22.Image light after being modulated by image-displaying member 22 projects to screen by projection optical system 24 amplification On 25.Image light after being projected by amplification, shows image on screen 25.

Then, the geometrical relationship of light-emitting area 12r, 12g, 12b, the plane of incidence 81 and display surface 23 is illustrated. Preferably in 3, light-emitting area 12r, 12g, 12b become conjugate relation with the plane of incidence 81.But, luminous The face shape of face 12r, 12g, 12b is not the shape similar to the face shape of the plane of incidence 81, and length-width ratio is different.Go out Penetrate face 82 and become conjugate relation with display surface 23.The face shape of exit facet 82 is similar to the face shape of display surface 23 Shape, length-width ratio is identical.Therefore, between light-emitting area 12r, 12g, 12b and the plane of incidence 81, due to length and width Light loss is produced than difference.In order to reduce this light loss, need to improve convergence optical system 1C.

Illustrate why producing this light loss.Here, by the concept of the propagation of explanation in embodiment 1 It is applied to the convergence optical system 1C and projection display device 2C of embodiment 3.Assume from light-emitting area 12r, The luminous intensity distribution of the light beam of 12g, 12b radiation is distributed as lambert (lambertian) distribution.Lambertian distribution spreads completely In the case of luminous intensity distribution distribution.

Propagation is by the long-pending definition of the area of light-emitting area with the solid angle of the light from light-emitting area radiation.Further, propagation by The area of sensitive surface defines with the long-pending of the solid angle of the light received at sensitive surface.As embodiment 1, face luminescence light The propagation Es of source 11r, 11g, 11b, the propagation Ei of integrating rod 8 and the propagation of image-displaying member 22 El is showed by below formula (5)～formula (7).

El=Al × π × sin²(θl)···(5)

Ei=Ai × π × sin²(θi)···(6)

Es=As × π × sin²(θs)···(7)

In formula (5), El is the propagation of image-displaying member 22.Al is the area of display surface 23.θ l be with Convergent angle θ i (aftermentioned) incides the ray relative of display surface 23 in the method for display surface 23 after inciding the plane of incidence 81 The angle (illumination angle) of line.π is pi.

In formula (6), Ei is the propagation of integrating rod 8.Ai is the area of the plane of incidence 81.θ i is to be taken into angle θ s (aftermentioned) radiates and incides the ray relative of the plane of incidence 81 in the plane of incidence 81 from light-emitting area 12r, 12g, 12b The angle (convergent angle) of normal.

In formula (7), Es is the propagation of face illuminating source 11r, 11g, 11b.As be light-emitting area 12r, 12g, The area of 12b.θ s is from light-emitting area 12r, 12g, 12b radiation and will to be taken by collimating lens 13r, 13g, 13b The ray relative with the radiation of largest extension angle in the light entered (takes in the angle of light-emitting area 12r, the normal of 12g, 12b Enter angle).

Generally, convergence optical system and lamp optical system are designed to above-mentioned propagation Es, Ei, El It is worth equal.Such as, if the size of display surface 23 is 16.0mm × 7.0mm.In the case of Gai, the length and width of display surface 23 Ratio is 16 to 7 (length-width ratios 16:7).The F value of the light that display surface 23 is illuminated will be set as 2.5.Now Illumination angle θ l be 11.53 degree (θ l ≈ 11.53 °).Use formula (5), image-displaying member 22 calculated as described below Propagation El, becomes to be of about 14.1.

El=Al × π × sin²(θl)

=(16.0 × 7.0) × π × sin²(11.53°)

≈14.1

Correspondingly, if the F value inciding the light of the plane of incidence 81 is 1.0.Convergent angle θ i now is 30 degree (θ i=30 °).The plane of incidence 81 is dimensioned so as to 6.4mm × 2.8mm.The length-width ratio of the plane of incidence 81 is 16 to 7 (length-width ratio 16: 7).Use formula (6), the propagation Ei of integrating rod 8 calculated as described below, become to be of about 14.1. The propagation Ei of integrating rod 8 can be equal with the propagation El of image-displaying member 22.

Ei=Ai × π × sin²(θi)

=(6.4 × 2.8) × π × sin²(30°)

≈14.1

Here, if the size of light-emitting area 12r of face illuminating source 11r, 11g, 11b, 12g, 12b is 2.7mm × 2.0mm. Light-emitting area 12r, the length-width ratio of 12g, 12b are 4 to 3 (length-width ratios 4: 3).And, if from light-emitting area 12r, 12g, 12b is that the luminous intensity distribution of the light beam of hemispherical radiation is distributed as lambertian distribution.In the case of hemispherical radiation, it is taken into angle θ s It is 90 degree (θ s=90 °).Use formula (7), calculated as described below should in the case of face illuminating source 11r, 11g, 11b Propagation Es, become be of about 17.0.

Es=As × π × sin²(θs)

=(2.7 × 2.0) × π × sin²(90°)

=17.0

Therefore, the propagation Es of face illuminating source 11r, 11g, 11b has the propagation than image-displaying member 22 The value big for propagation Ei of El and integrating rod 8.Propagation is optical invariant.The propagation Ei of integrating rod 8 is less than The propagation Es of face illuminating source 11r, 11g, 11b means to produce light loss.

According to research to light utilization ratio based on propagation before this, at length-width ratio and the convergence plane of light-emitting area In the case of the length-width ratio difference of (i.e. the plane of incidence 81), existing convergence optical system produces light loss.But It is, owing to propagation is amassed or the area of sensitive surface by the area of light-emitting area is with the solid angle of the light from light-emitting area radiation With the long-pending definition of the solid angle of the light received at sensitive surface, therefore, it can show two-dimentional relation.In the length to light-emitting area When the utilization ratio of the energy in the case of wide ratio is different with the length-width ratio of convergence plane is studied, in addition it is also necessary to study one-dimensional Relation.

Therefore, below, use the formula of one-dimensional performance propagation that light utilization ratio is studied.Here, opposite is sent out Radiant 11r, 11g, 11b illustrate with the relation of integrating rod 8.When using the formula of one-dimensional performance propagation, The condition not producing light loss between face illuminating source 11r, 11g, 11b and integrating rod 8 is to meet formula (8) With 2 condition both sides shown in formula (9).

xs×sin(θs)≦xi×sin(θi)···(8)

ys×sin(θs)≦yi×sin(θi)···(9)

In formula (8) and formula (9), xs represents the length in horizontal (x direction) of light-emitting area 12r, 12g, 12b. Ys represents the length of the longitudinal direction (y direction) of light-emitting area 12r, 12g, 12b.Xi represents the horizontal (x of the plane of incidence 81 Direction) length.Yi represents the length of the longitudinal direction (y direction) of the plane of incidence 81.

By in the explanation of formula (5)～(7) narration each portion size substitute into formula (8) time, the left side of formula (8) and The right is the most as described below.

Xs × sin (θ s)=2.7 × sin (90 °)=2.7

Xi × sin (θ i)=6.4 × sin (30 °)=3.2

It therefore meets the condition of formula (8).I.e., it is known that light loss will not be produced on laterally (x direction).

Equally, the left side and the right of formula (9) are the most as described below.

Ys × sin (θ s)=2.0 × sin (90 °)=2.0

Yi × sin (θ i)=2.8 × sin (30 °)=1.4

Therefore, ys × sin (θ s) > yi × sin (θ i), it is unsatisfactory for the condition of formula (9).I.e., it is known that at longitudinal direction (y Direction) on produce light loss.

As above-mentioned example, only by formula (5)～(7), the length-width ratio of light-emitting area and the length-width ratio of convergence plane are not Light loss in the case of Tong is insufficient, it is necessary to use the formula (8) of one-dimensional performance propagation and formula (9) both sides to enter Row research.In the case of the length-width ratio of light-emitting area and the length-width ratio of convergence plane are different, it is being unsatisfactory for formula (8) and formula (9), in the existing convergence optical system of the either or both in, it is inevitably generated light loss.

However, it is difficult to be taken into the whole light from face illuminating source 11r, 11g, 11b radiation.It is taken into whole light of radiation Refer to that being taken into angle θ s is 90 degree (θ s=90 °).And, it is contemplated that foozle and uniformity, to display surface 23 When being illuminated, typically it is illuminated in the way of more slightly larger than display surface 23.Call it as illuminating surplus.Thus, Indeed, it is possible to according to the specification of optical system, suitably the size etc. being taken into angle and the plane of incidence 81 is optimized.

In light-emitting area with convergence plane in the light loss of the convergence optical system that length-width ratio is different, such as embodiment 1 As middle explanation, exist the light loss caused due to angle and the light loss that causes due to area this 2 Plant light loss.The light loss caused due to angle refers to, due to the light that radiates from light-emitting area with more than allow into The light loss that the angle of firing angle degree incides convergence plane and causes.The light loss caused due to area refers to, by The light loss caused beyond convergence plane it is focused in the light radiated from light-emitting area.

Here, as a reference example 2, the structure in the case of generation light loss is illustrated.For convenience of description, Use the label identical with the structural element of embodiment 3 that the structural element of reference example 2 is illustrated.Figure 22 is The figure of the structure of the convergence optical system of reference example 2 is shown.(A) of Figure 22 is to observe collecting optics from+y direction The figure of system, (B) of Figure 22 is the figure observing convergence optical system from+x direction.In fig. 22, face luminescence light Source 11r, 11g, 11b are unified to be represented by the reference numeral 11, and light-emitting area 12r, 12g, 12b unification are represented by the reference numeral 12. Collimating lens 13r, 13g, 13b are unified to be represented by the reference numeral 13.The convergence optical system of reference example 2 be utilize existing Design techniques design, be produce light loss convergence optical system.

The light radiated from light-emitting area 12 is converted into parallel by collimating lens 13 by the convergence optical system of reference example 2 Light, is focused at this directional light on the plane of incidence 81 of integrating rod 8 via collecting lens 4.

Figure 23 is the schematic diagram of the zone of convergence of the illumination light in the plane of incidence 81 of the integrating rod 8 illustrating reference example 2. In fig 23, label B represents zone of convergence.Specification according to the image-displaying member 22 i.e. area of display surface 23 With the size that F value etc. determines the plane of incidence 81.

As shown in (A) of Figure 22, in reference example 2, the convergent angle θ i in the plane of incidence 81 is allowing angle of incidence In the range of.Allow that angle of incidence is the predetermined angular that can effectively utilize light.Therefore, do not exist owing to light is with invalid incidence The light loss that angle (cannot effectively utilize the angle of light) is incident and causes.That is, do not produce and cause due to angle Light loss.

But, by as mentioned above convergent angle θ i being set to the angle not producing the light loss caused due to angle Degree, it is possible to uniquely determining according to propagation can the area of zone of convergence.Therefore, such as (B) and Figure 23 institute of Figure 22 Showing, illumination light is exposed from the scope of the plane of incidence 81 of integrating rod 8 in y-direction.That is, generation is drawn due to area The light loss risen.

Figure 24 is the figure of the structure of the convergence optical system illustrating reference example 3.(A) of Figure 24 is to see from+y direction Examining the figure of convergence optical system, (B) of Figure 24 is the figure observing convergence optical system from+x direction.Reference example 3 Convergence optical system be use existing design techniques design, be produce light loss convergence optical system.

The convergence optical system of reference example 3 has toric lens 50.That is, the convergence optical system of reference example 3 passes through The light radiated from light-emitting area 12 is converted into directional light by collimating lens 13, makes directional light incide collecting lens 4 and carries out Assemble, and then be focused on the plane of incidence 81 of integrating rod 8 via toric lens 50.

Figure 25 is the schematic diagram of the zone of convergence of the illumination light in the plane of incidence 81 of the integrating rod 8 illustrating reference example 3. In fig. 25, label B represents zone of convergence.

Toric lens 50 can have respectively different refractive power on x direction and y direction.In reference example 3, 1st face 51 of the light incident side of toric lens 50 and the 2nd face 52 of emitting side have refractive power the most in y-direction. Thus, as shown in figure 25, it is possible to prevent the light loss caused due to area.But, such as (B) of Figure 24 Shown in, the convergent angle in the y direction in the plane of incidence 81 is more than allowing angle of incidence (α).That is, in reference example 3, produce The raw light loss caused due to angle.Light loss in the case of Gai is and reference example 2 (Figure 22, Figure 23) The identical light loss of situation.

As reference example 2 and reference example 3, different from the length-width ratio of the plane of incidence 81 in the length-width ratio of light-emitting area 12 In the case of, produce the light loss or the light loss caused due to angle caused due to area or they are double Side.In embodiments of the present invention 3, it is possible to use toric lens, reduce the y side shown in (B) of Figure 24 To the light loss caused due to angle.

Figure 26 is the figure of the structure of the convergence optical system 1C illustrating embodiment 3.Here, face illuminating source 11r, 11g, 11b are unified to be represented by the reference numeral 11, and light-emitting area 12r, 12g, 12b unification are represented by the reference numeral 12.Collimating lens 13r, 13g, 13b are unified to be represented by the reference numeral 13.Further, if optical axis direction is z direction, it is laterally x direction, vertical To for y direction.(A) of Figure 26 is the figure of the convergence optical system 1C observing embodiment 3 from+y direction. (B) of Figure 26 is the figure of the convergence optical system 1C observing embodiment 3 from+x direction.

The convergence optical system 1C of embodiment 3 passes through collimating lens 13 by from the light-emitting area 12 of face illuminating source 11 The light of radiation is converted into directional light.Directional light incides collecting lens 4 to be assembled.After being assembled by collecting lens 4 Light incides convergence F value and controls lens 5, is focused on the plane of incidence 81.

As shown in (B) of Figure 26, when observing the convergent angle θ i in y direction, the convergent angle of the central part of the plane of incidence 81 θ i is different from the convergent angle θ i of the edge of the plane of incidence 81.More specifically, the convergent angle θ i of the central part of the plane of incidence 81 Convergent angle θ i less than the edge of the plane of incidence 81.Y direction is that the anchor ring by assembling F value control lens 5 is to length and width The direction of light loss is i.e. produced than the direction being compressed.It addition, being compressed in of length-width ratio is described below.

That is, in (B) of Figure 26, when the image formation state of the light observed in the face parallel with y-z plane, from sending out The light of the edge radiation in the y direction of bright finish 12r, 12g, 12b is to specify multiplying power imaging, to arrive the plane of incidence 81 Edge.On the other hand, the light of the central part radiation from light-emitting area 12r, the y direction of 12g, 12b is to put than from edge The imaging multiplying power imaging that the imaging multiplying power of the light penetrated is big.In other words, compared with the light radiated from edge, y direction, from sending out The light of the y direction central part radiation of bright finish 12r, 12g, 12b is with less convergent angle θ i imaging on the plane of incidence 81.

Figure 27 is to be shown in y-z plane, is focused at integrating rod 8 from the light of light-emitting area 12r, 12g, 12b radiation The plane of incidence 81 on the schematic diagram of state.Figure 27 observes the figure near the plane of incidence 81 from+x direction.

Put in the way of there is certain extended corner from the light a little radiated to+z direction light-emitting area 12r, 12g, 12b Penetrate.The maximum angle that collimated lens 13r, 13g, 13b in the light of radiation is taken into is for being taken into angle θ s.It is taken into angle θ s Defined by relative to the angle of light-emitting area 12r, the normal of 12g, 12b.Therefore, in y-z plane, relative to z Direction, deposit in the+y-direction be taken into angle θ s1 radiation light and-y direction on be taken into angle θ s2 radiation light.

On the other hand, the light of any inciding the plane of incidence 81 is assembled in the way of having certain angle.Incide into The angle of the light of any penetrating face 81 is convergent angle θ i.Convergent angle θ i is by the angle of the normal relative to the plane of incidence 81 Definition.Therefore, in y-z plane, relative to z direction, exist the light incident with convergent angle θ i1 from+y direction and From-y direction with the light that convergent angle θ i2 is incident.In figure 27, label u1, v1 illustrates with convergent angle θ i1 incidence Light.Further, label u2, v2 illustrates the light incident with convergent angle θ i2.

Put being taken into angle θ s2 from the edge (with reference to (B) of Figure 26) of light-emitting area the 12r ,-y direction of 12g, 12b The light penetrated is focused on the plane of incidence 81 with convergent angle u2.From light-emitting area 12r ,-y the direction of 12g, 12b edge with The light being taken into angle θ s1 radiation is focused on the plane of incidence 81 with convergent angle u1.

From light-emitting area 12r, the y direction of 12g, 12b central part (with reference to (B) of Figure 26) to be taken into angle θ s2 The light of radiation is focused on the plane of incidence 81 with convergent angle v2.From light-emitting area 12r, the central authorities in the y direction of 12g, 12b Portion is focused on the plane of incidence 81 with convergent angle v1 with the light being taken into angle θ s1 radiation.

If allowing that angle of incidence is α for integrating rod 8.Allow that incident angle α is by the normal relative to the plane of incidence 81 Angle defines.In the edge of the plane of incidence 81, convergent angle u1, u2 are more than allowing incident angle α, therefore, produce due to Angle and the light loss that causes.On the other hand, at the central part of the plane of incidence 81, owing to convergent angle v1, v2 are less than Convergent angle u1, u2, therefore, it is possible to eliminate the light loss caused due to angle, or at least can be pressed down Prepare the edge less than the plane of incidence 81.

As a result of which it is, compared with the reference example 3 of (B) of Figure 24, from light-emitting area 12r, the central part of 12g, 12b To edge, it is possible to reduce the light loss caused due to angle.In the case of Gai, from light-emitting area 12r, 12g, 12b Light convergent angle v1, v2 in y-direction of central authorities' radiation closer to allowing incident angle α, light loss is the least. It is therefore preferable that make convergent angle v1, v2 for allowing below incident angle α.

It addition, in embodiment 3, make the size of 2 secondary light source pictures of light-emitting area and the equivalently-sized of the plane of incidence 81, But it is not limited to this structure, it is also possible to somewhat increase the deformation of imaging multiplying power etc..

Figure 28 be illustrate light-emitting area 12r, 12g, 12b small light-emitting zone as in y-z plane at integrating rod 8 The plane of incidence 81 on the schematic diagram of state of imaging.Face illuminating source 11r, 11g, 11b are unified to be represented by the reference numeral 11, Light-emitting area 12r, 12g, 12b unification are represented by the reference numeral 12.Collimating lens 13r, 13g, 13b are unified by label 13 Represent.

In Figure 28, if the tiny length in the y direction of the small light-emitting zone on light-emitting area 12r, 12g, 12b is △a.In Figure 28, it is shown that with light-emitting area vertically from light-emitting area 12r, the tiny length of the central part of 12g, 12b The light of the region injection of △ a.Further, in the figure, it is shown that with light-emitting area vertically from light-emitting area 12r, 12g, The light of the region injection of the tiny length △ a of the edge of 12b.

Light-emitting area 12r, the small light-emitting zone of tiny length △ a of central part of 12g, 12b become on the plane of incidence 81 As becoming the picture of tiny length △ c.On the other hand, the tiny length △ a of the edge of light-emitting area 12r, 12g, 12b The imaging on the plane of incidence 81 of small light-emitting zone become the picture of tiny length △ p.As it has been described above, the plane of incidence 81 Convergent angle v1, v2 (Figure 27) of central part is less than convergent angle u1, u2 of edge, in other words, the imaging of central part Multiplying power is more than the imaging multiplying power of edge.Therefore, tiny length △ c is more than tiny length △ p.Thus, do not produce by The light loss (that is, light will not expose from the plane of incidence 81) caused in area, it is possible to reduce and cause due to angle Light loss.

Figure 29 is to illustrate that assembling F value controls structure and the schematic diagram of converging action thereof of lens 5.(A) of Figure 29 Being the figure observed from+x direction, (B) of Figure 29 is the figure observed from+y direction.Assemble F value control lens 5 to have There is the 1st face 52, face the 51 and the 2nd.1st face 51 is the face of the incident light from face illuminating source 11r, 11g, 11b. 2nd face 52 is from assembling the face that the light in the 1st face 51 is incided in control lens 5 injection of F value.1st face 51 and 2 faces 52 are anchor ring.It addition, anchor ring also comprises the face of cylinder.

Assemble F value control lens 5 and there are 2 functions.1st function is the function being compressed length-width ratio.2nd Function is to assembling the function that F value is controlled.1st function be the length-width ratio to x direction be compressed function, Or the function that the length-width ratio in y direction is compressed.Further, the 2nd function is to compression length and width in the plane of incidence 81 The function that the convergence F value in the direction of ratio is controlled.

First, the function (the 1st function) of compression length-width ratio is illustrated.As shown in (A) of Figure 29, the 1st Face 52, face the 51 and the 2nd is respectively provided with in y-z plane the shape protruded to+z direction.On the other hand, such as Figure 29 (B), shown in, the curvature in the x direction in the 1st face 52, face the 51 and the 2nd is infinity.That is, there is smooth shape Shape.

Therefore, the angle of incidence as shown in (B) of Figure 29, in x-z-plane, during light to 1 face 51 Spend identical with injection angle when penetrating from the 2nd face 52.Assemble F value control lens 5 make from light-emitting area 12r, 12g, The light of 12b injection is focused on the plane of incidence 81 with expected angle.

On the other hand, as shown in (A) of Figure 29, the light in y direction is the light of the compression direction of length-width ratio.y The light in direction refers to the light on the face parallel with y-z plane.Therefore, it is necessary to the big angle of the light than x direction Degree incides the plane of incidence 81.The light in x direction refers to the light on the face parallel with x-z-plane.Now, in order to The plane of incidence 81 makes the convergence of rays in y direction at an arbitrary position, according to converged position, compared with the light in x direction, Need extend optical path length or shorten optical path length.Therefore, anchor ring at least needs 2.This anchor ring is in the compression side of length-width ratio Upwards there is refractive power.The compression direction of length-width ratio is y direction.These 2 anchor rings are the 1st faces 52, face the 51 and the 2nd.

Then, the function (the 2nd function) controlling to assemble F value is illustrated.In (A) of Figure 29, meeting It is the refractive power the making central part song less than the refractive power of periphery that poly-F value controls the curvature in the y-z plane of lens 5 Rate.It addition, the refractive power assembling the central part that F value controls lens 5 is to make from light-emitting area 12r, the y of 12g, 12b The ability of the light refraction of direction central part injection.Further, the refractive power assembling the periphery that F value controls lens 5 is Make the ability of the light refraction penetrated from the edge in light-emitting area 12r, the y direction of 12g, 12b.

Assembling F value control lens 5 can make convergent angle v1, v2 in the plane of incidence 81 less than convergent angle u1, u2. Convergent angle v1, v2 are the convergent angles in the y direction of the light of the central part being focused at the plane of incidence 81.Convergent angle u1, U2 is the convergent angle in the y direction of the light of the edge, y direction being focused at the plane of incidence 81.That is, assemble F value to control thoroughly Mirror 5 can control the convergence F value in the direction (being y direction here) being compressed length-width ratio in the plane of incidence 81.

It addition, in the above description, only assemble F value control lens 5 have make on the compression direction of length-width ratio into Penetrate the function that convergent angle u1, u2 are the angle different from convergent angle v1, v2 of central part of the edge in face 81.But It is not limited to this structure.For example, it is also possible to utilize multiple lens to constitute assemble F value control lens 5, the plurality of Mirror has that to make convergent angle u1, u2 of edge on the compression direction of length-width ratio be convergent angle v1, the v2 with central part The function of different angles.

Further, as long as the entirety of convergence optical system 1C can play this function and (make on the compression direction of length-width ratio The function that convergent angle u1, u2 are the angle different from convergent angle v1, v2 of central part of the edge of the plane of incidence 81) ?.For example, it is possible to this function is given to constitute the collimating lens 13r of convergence optical system 1C, 13g, 13b, Collecting lens 4 and certain lens assembled in F value control lens 5, or, it is also possible to dispersion is given to constitute and assembles Multiple lens of optical system 1C.

Below, the numerical example 2 of the convergence optical system 1C of embodiment 3 is illustrated.Table 8 illustrates meeting The optical data of poly-optical system 1C.Figure 30 is the structure of the convergence optical system 1C of the optical data illustrating table 8 Figure.(A) of Figure 30 is the figure observing convergence optical system 1C from x direction.(B) of Figure 30 is from y The figure of convergence optical system 1C is observed in direction.

Convergence optical system 1C shown in Figure 30 by face illuminating source 11, collimating lens 513,613, collecting lens 114, toric lens 115 and integrating rod 8 are constituted.

In the present embodiment, light-emitting area 12r of face illuminating source 11, the size of 12g, 12b are 2.7mm × 2.0mm. The size of the plane of incidence 81 of integrating rod 8 is 6.39mm × 2.86mm.From face illuminating source 11 light be taken into angle It it is 80 degree.Allow that angle of incidence is 30 degree for integrating rod 8.In the case of Gai, F value be 1.0 (F value=1.0). This is equivalent to carry out with the region of the 15.97mm × 7.16mm on the F2.5 display surface 23 to image-displaying member 22 Illumination.In the case of Gai, illumination angle θ l be about 11.5 degree.The refractive index of the glass material that each lens use is 1.52.

[table 8]

In the numbering Si hurdle, face of the optical data shown in table 8, illustrate i-th corresponding to the label Si shown in Figure 30 The numbering in face.I is the natural number of more than 1.The face being set in the structural element near object side is the 1st (i=1). Object side is illuminating source 11r, 11g, 11b side, face.Numbering i increases successively towards image side.OBJ represents object plane, It is light-emitting area 12r, 12g, 12b in fig. 30.IMA is expressed as image planes, is the plane of incidence 81 in fig. 30.CG It it is the bell glass (parallel flat) of face illuminating source.

Further, in table 8, face S6, S7, S8 become aspherical shape.Table 9 illustrates aspherical surface data.

[table 9]

Face is numbered	S6	S7	.S8
				k	-6.62448E-01	-2.081848E-01	1.32866E+05
A1	0	0	0
				A2	0	0	0
A3	0	0	0
				A4	-1.153015E-05	-1.972017E-05	-5.202847E-05
A5	0	0	0
				A6	-1.601567E-08	1.053233E-07	2.461847E-07
A7	0	0	0
				A8	5.269177E-11	-3.518916E-10	-2.534288E-08
A9	0	0	0
				A10	5.93521E-14	1.836680E-13	-2.534288E-08

Aspherical surface data shown in table 9 illustrates each coefficient of the formula of the aspherical shape represented by below formula (10) The value of k, Ai.Coefficient k represents whose conic coefficient.Coefficient C represents the curvature at vertex of surface.Coefficient Ai represents The asphericity coefficient of i time.Z is the aspheric surface amount of recess (degree of depth: mm) of the position separating radius r (mm) from optical axis. Amount of recess is (benchmark on the basis of the plane vertical with optical axis to comprise each of lens and the intersection point of optical axis (vertex of surface) Face), the distance of the shape from datum level to lens face relative to the distance between optical axis.

Z1 (r)=C r²/{1+(1-(1+k)·C²·r²)^1/2}+∑Ai·ri

(i=1～n) ... (10)

Further, in table 8, face S9, S10 become aspheric surface i.e. torus shape.Table 10 illustrates aspherical surface data.

[table 10]

Face is numbered	S9	S10
			k	6.659493E+00	-4.57159E-01
A1	0	0
			A2	0	0
A3	0	0
			A4	-3.904142E-06	4.766106E-05
A5	0	0
			A6	-2.534288E-08	4.766106E-05
A7	0	0
			A8	6.541012E-22	-1.46983E-07
A9	0	0
			A10	-1.219541E-13	-4.307774E-13

Aspherical surface data shown in table 10 illustrates each system of the formula of the aspherical shape represented by below formula (11) The value of number k, Ai.Coefficient k represents whose conic coefficient.Coefficient C represents the curvature at vertex of surface.Coefficient Ai table Show the asphericity coefficient of i time.Z is the aspheric surface of the position separating radius ry (mm) in y-direction from optical axis Amount of recess (degree of depth: mm).

Z1 (y)=C ry²/{1+(1-(1+k)·C²·ry²)^1/2}+ΣAi·ryi²I (i=1～n) (11)

It addition, table 8, table 9 and the optical data shown in table 10 are for illustrating the convergence optics in embodiment 3 The function of system 1C.Such as, in numerical example 2, it is used mostly non-spherical lens, but it is also possible to put Change multiple spherical lens into.The glass material that lens use can also use the various glass materials that refractive index is different.

Collimating lens 13 is made up of the 1st collimating lens the 513 and the 2nd these 2 pieces of lens of collimating lens 613.Face is luminous Light source 11 side is the 1st collimating lens 513.Integrating rod 8 side is the 2nd collimating lens 613.Collecting lens 4 is by optically focused These 1 piece of lens of lens 114 are constituted.Assemble F value control lens 5 to be made up of these 1 piece of lens of toric lens 115.

It addition, whole by reference number 11 represents face illuminating source 11r, 11g, 11b.Whole by reference number 13 represents collimation Lens 13r, 13g, 13b.Whole by reference number 513 represents the 1st collimating lens 513r, 513g, 513b.Unified use Label 613 represents the 2nd collimating lens 613r, 613g, 613b.

Figure 31 is the figure of the analog result illustrating the convergent point on the plane of incidence 81.Quadrilateral frame in Figure 31 illustrate into Penetrate the scope in face 81.Transverse axis is x-axis, and the right direction of transverse axis is+x direction.The longitudinal axis is y-axis, the upper direction of the longitudinal axis For+y direction.It addition, in Figure 31, representative is from 3 kinds of wavelength of face illuminating source 11r, 11g, 11b injection Light (red light, green light, blue light) and the convergent point of the light of wavelength 550nm is shown.

Convergent point is formed by following 9 light.That is, convergent point is by radiating from the corner of light-emitting area 12r, 12g, 12b Light, from the light of the center of light-emitting area 12r, 12g, 12b radiation and from light-emitting area 12r, each limit of 12g, 12b The light of midpoint radiation is formed.The length-width ratio of light-emitting area 12r, 12g, 12b is changed, from light-emitting area 12r, 12g, The light of 12b injection is focused on the plane of incidence 81.

Table 11 illustrates that the convergence of rays of point P1～the P9 radiation from the light-emitting area 12 of Figure 32 definition is at integrating rod 8 The plane of incidence 81 on time x direction and the F value in y direction.

Radial location P1 is the point of the end through the-x direction on the straight line in the x direction at the center of light-emitting area 12. Radial location P2 is the central point of light-emitting area 12.Radial location P3 is the x direction at the center through light-emitting area 12 The point of the end in+x direction on straight line.Radial location P7 is the-x on the limit of the end in light-emitting area 12+y direction The point of the end in direction.Radial location P8 is the central point on the limit of the end in light-emitting area 12+y direction.Radiation Position P9 is the point of the end in+x direction on the limit of the end in light-emitting area 12+y direction.Radial location P4 is The midpoint of radial location P1 and radial location P7.In radial location P5 radial location P2 and radial location P8 Point.Radial location P6 is the midpoint of radial location P3 and radial location P9.

The convergent angle θ i in the y direction on the plane of incidence 81 is the least the closer to the center of the plane of incidence 81.Therefore, at table In 11, exist the closer to light-emitting area 12r, center, the y direction tendency that then F value is the biggest of 12g, 12b, exist and more lean on The closely edge tendency that then F value is the least in the y direction of light-emitting area 12r, 12g, 12b.

[table 11]

The radial location of light	The convergence F value in y direction	The convergence F value in x direction
			P1	0.807	1.041
P2	0.808	1.047
			P3	0.807	1.041
P4	0.803	1.040
			P5	0.804	1.046
P6	0.803	1.040
			P7	0.756	1.036
P8	0.756	1.043
			P9	0.756	1.036

Below, the comparative example 2 contrasted the effect of the convergence optical system 1C being used for embodiment 3 is carried out Explanation.The convergence optical system of this comparative example 2 is configured to make from face illuminating source 11r, 11g, 11b radiation Light is to allow the general convergence optical system that incident angle α is focused on the plane of incidence 81 of integrating rod 8.

Table 12 illustrates the optical data of the convergence optical system of comparative example 2.Figure 33 is the optical data illustrating table 12 The figure of structure of convergence optical system.As shown in figure 33, the convergence optical system of comparative example 2 is by face illuminating source 11, collimating lens 513,613, collecting lens 114,214 and integrating rod 8 are constituted.It addition, face illuminating source 11r, 11g, 11b are represented by the reference numeral 11.Light-emitting area 12r, 12g, 12b are represented by the reference numeral 12.1st collimating lens 513r, 513g, 513b are represented by label 513.2nd collimating lens 613r, 613g, 613b is represented by label 613.

In comparative example 2, light-emitting area 12r, the size of 12g, 12b are 2.7mm × 2.0mm.The chi of the plane of incidence 81 Very little for 6.39mm × 2.86mm.It it is 80 degree from the angle θ s that is taken into of the light of face illuminating source 11r, 11g, 11b radiation. For integrating rod 8 the plane of incidence 81 allow that incident angle α is 30 degree.F value now is 1 (F value=1).This Be equivalent to F2.5, the region of the 15.97mm × 7.16mm on display surface 23 is illuminated.Illumination angle θ l now It is about 11.5 degree.The refractive index of the glass material that each lens use is 1.52.That is, light-emitting area 12 size, enter Penetrate the size in face 81, be taken into angle θ s, allow incident angle α, illumination angle θ l, the wavelength of light and the refraction of glass material Rate is identical with numerical example 2.

[table 12]

The token of table 12 is identical with table 9.Table 13 illustrates aspherical surface data.

[table 13]

Face is numbered	S8	S7	S8
				k	-8.640797E-01	-1.045821E+0	2.723633E+0
A1	0	0	0
				A2	0	0	0
A3	0	0	0
				A4	-3.939562E-06	-4.731498E-06	-1.052019E-03
A5	0	0	0
				A6	-8.955316E-09	3.404733E-06	-7.764107E-05
A7	0	0	0
				A8	4.683632E-11	-4.518802E-08	2.025371E-06
A9	0	0	0
				A10	5.222783E-14	5.342016E-10	1.165955E-07

As table 11, table 14 illustrate from Figure 32 definition face illuminating source 11r, 11g, 11b some P1～ X direction when the convergence of rays of P9 radiation is on the plane of incidence 81 of integrating rod 8 and the F value in y direction.At comparative example In 2, the convergent angle θ i on the plane of incidence 81 is designed in the edge of the center of the plane of incidence 81 and the plane of incidence 81 substantially Identical.Therefore, unrelated with radial location P1～P9 of light, F value substantially 1.

[table 14]

The radial location of light	The convergence F value in y direction	The convergence F value in x direction
			P1	0.978	0.983
P2	1.038	1.038
			P3	0.978	0.983
P4	0.972	0.976
			P5	1.031	1.030
P6	0.972	0.976
			P7	0.953	0.954
P8	1.008	1.006
			P9	0.953	0.954

As Figure 31, Figure 34 is the figure of the analog result illustrating the convergent point on the plane of incidence 81.In Figure 34 four Limit shape frame illustrates the scope of the plane of incidence 81.Transverse axis is x-axis, and the right direction of transverse axis is+x direction.The longitudinal axis is y-axis, The upper direction of the longitudinal axis is+y direction.It addition, in Figure 34, represent and penetrate from face illuminating source 11r, 11g, 11b The light (red light, green light, blue light) of 3 kinds of wavelength and the convergent point of the light of wavelength 550nm is shown.

Owing to the length-width ratio of light-emitting area 12r, 12g, 12b is different with the length-width ratio of the plane of incidence 81, therefore, when set into Penetrate the convergent angle θ i on face 81 with when allowing that incident angle α is equal, do not produce the light loss caused due to angle. But, owing to imaging multiplying power is relatively big, therefore, the light radiated from the edge in light-emitting area 12r, the y direction of 12g, 12b It is focused at the edge in the y direction than the plane of incidence 81 in the outer part.That is, the light loss caused due to area is produced.

Table 15 is the table that contrast illustrates the convergence efficiency on the plane of incidence 81 of comparative example 2 and numerical example 2.At table In 15, allow that incident angle α is 30 degree.The convergence efficiency of comparative example 2 is 70.19%.On the other hand, Numerical implementation The convergence efficiency of example 2 is 80.01%.Compared with comparative example 2, the convergence efficiency of numerical example 2 improves 13.99%. Relative efficiency is to set comparative example 2 as the convergence efficiency (light utilization ratio) in the case of 100%.

[table 15]

Project	Comparative example 2	Numerical example 2
			Convergence efficiency (allowing angle of incidence 30 degree) on the plane of incidence of integrating rod	70.19%	80.01%
Relative efficiency (comparative example=100%)	100%	113.99%

It addition, suitably determine the size of integrating rod 8 according to light-emitting area 12r, the size of 12g, 12b and illumination F value. Thus, it is believed that the light inciding integrating rod 8 arrives screen 25, except illuminating the transmission loss of surplus, lens etc. Beyond the loss in image-displaying member 22, there is no light loss in principle.

As described above, the convergence optical system 1C and projection display device 2C of embodiment 3 The convergent angle θ i making the central part of the plane of incidence 81 is less than the convergent angle θ i of edge.Particularly make to be focused at the plane of incidence 81 The convergent angle of light of central part of compression direction (in above-mentioned example for y direction) of length-width ratio less than being focused at the party To the convergent angle of light of edge.Thus, in light-emitting area 12r, the length-width ratio of 12g, 12b and the length of the plane of incidence 81 In the case of width is than difference, it is also possible to reduce the light loss in integrating rod 8, it is possible to increase the light profit in integrating rod 8 Use efficiency.

Embodiment 4

Figure 35 is roughly to illustrate that the convergence optical system 1D of embodiments of the present invention 4 and projecting image show The structure chart of the structure of device 2D.As shown in figure 35, integrating rod 80 has taper, and this point is with embodiment 3 not With.Integrating rod 80 is light intensity distributions uniformization element.

In Figure 35, to embodiment 3 in explanation convergence optical system 1C and projection display device The structural element that the structural element of 2C is identical marks identical label and the description thereof will be omitted.The projection figure of embodiment 4 As display device 2D have all identical with embodiment 3 face illuminating source 11r, 11g, 11b, collimating lens 13r, 13g, 13b, dichroic mirror 6,7, collecting lens 4, assemble F value control lens 5, lamp optical system 21, image Display element 22, projection optical system 24 and screen 25.In Figure 35, short single dotted broken line represents red (R) Light, long dotted line represents green (G) light, and short dash line represents blue (B) light.

Light from face illuminating source 11r, 11g, 11b is assembled by the convergence optical system 1C of above-mentioned embodiment 3 The plane of incidence 81 of integrating rod 8 carries out homogenization.And, as illustrate with reference to Figure 31, in the x direction, Almost all convergent point is all converged in the range of the plane of incidence 81.I.e., in the x direction almost without due to area The light loss caused.

On the other hand, in y-direction, the meeting of the light radiated from the edge in light-emitting area 12r, the y direction of 12g, 12b Accumulation is more more outward than the edge in the y direction of the plane of incidence 81.That is, the light loss caused due to area is produced. This is because, in y-direction, it is difficult to penetrate with the angle θ s that is taken into of 80 degree from face illuminating source 11r, 11g, 11b The whole convergences of rays gone out are in the range of the plane of incidence 81.The convergence optical system 1D of embodiment 4 drops further The loss caused due to area on this y direction low.

Figure 36 (A) illustrates the structure of the general integrating rod 8 with prism shape, and (B) of Figure 36 illustrates tool There is the structure of the integrating rod 80 of taper.(A) of Figure 36 and (B) of Figure 36 are all the figures observed from+y direction.

As shown in (A) of Figure 36, in general integrating rod 8, inciding the incidence angle θ in of the plane of incidence 81 ForTime, from the angle of emergence θ out of exit facet 82 injection it isThat is, in general integrating rod 8, incide The incidence angle θ in of the light of the plane of incidence 81 and equal from the angle of emergence θ out of the light of exit facet 82 injection.Here, Incidence angle θ in is convergent angle θ i.

On the other hand, the integrating rod 80 shown in (B) of Figure 36 has the area of the plane of incidence 810 less than exit facet 820 The taper of area.In the case of Gai, at the incidence angle θ in inciding the plane of incidence 810 it beTime, angle of emergence θ out ForThat is, the angle of emergence θ out of light is less than incidence angle θ in.In the case of Gai, according to the incidence of light Angle θ in, coning angle β, taper integrating rod 80 in order of reflection m, provide light by below formula (12) Angle of emergence θ out.

θ out=θ in-2 × m × β (12)

The convergence optical system 1D of embodiment 4 utilizes the relation of formula (12).Figure 37 is shown for general Integrating rod 8 and there is the figure of zone of convergence B1, B2 of the plane of incidence 81,810 of integrating rod 80 of taper.Figure 37 (A) be shown for the zone of convergence B1 of embodiment 3 of the plane of incidence 81.(B) of Figure 37 be shown for into Penetrate the zone of convergence B2 of the embodiment 4 in face 810.In (B) of Figure 37, zone of convergence B2 and the plane of incidence 810 is consistent.It addition, the dotted line of (B) of Figure 37 represents that the plane of incidence 81 of (A) of Figure 37 is to compare.

In the numerical example 2 of above-mentioned embodiment 3, in the x direction, light can be to hoping convergent angle θ i meeting Gather in the range of the plane of incidence 81, but, in y-direction, as shown in (A) of Figure 37, except due to angle And beyond the light loss caused, also produce the light loss caused due to area.Therefore, at embodiment 4 Convergence optical system 1D in, as shown in (B) of Figure 37, make the zone of convergence in x direction in the plane of incidence 810 B2 is narrower than the zone of convergence B1 of embodiment 3.Thereby, it is possible to the convergence zone in the y direction reduced in the plane of incidence 810 Territory B2, as a result of which it is, the light loss caused due to area in y direction can be reduced.

Here, if the angle of emergence θ out of (A) of Figure 36 is angleAs the angle of emergence θ out with (B) of Figure 36 Time identical, the incidence angle θ in (=θ out) of (A) of Figure 36 is angleIn the case of Gai, due to incidence angle θ in It is convergent angle θ i, therefore, with the convergent angle i.e. angle of θ i of the light in the x direction of embodiment 3Compare, implement The convergent angle i.e. angle of θ i of the light in the x direction of mode 4Bigger.

(A) and (B) of Figure 38 is the structure of the integrating rod 80 that general integrating rod 8 and taper are shown respectively Axonometric chart.In (A) of Figure 38, the incidence angle θ in the plane of incidence 81 of integrating rod 8 is angleOutgoing Angle of emergence θ out in face 82 is also angleOn the other hand, in (B) of Figure 38, entering of integrating rod 80 Penetrating the incidence angle θ in face 810 is angleAngle of emergence θ out in exit facet 820 is angle

Being as noted previously, as incidence angle θ in is convergent angle θ i, therefore, with the light in the x direction of embodiment 3 The angle of convergent angle θ iCompare, the angle of the convergent angle θ i of the light in the x direction of embodiment 4Bigger.

Therefore, in embodiment 4, as shown in (B) of Figure 36 and (B) of Figure 38, by making integrating rod 80 is taper, carries out the angular transition of the light in x direction.In the plane of incidence 810, the convergent angle θ i in x direction is AngleThe light in x direction is repeated total reflection in the inside of the integrating rod 80 of taper.And, at exit facet In 820, the angle of emergence θ out in x direction is angleThe angle of emergence θ out of embodiment 4 and embodiment 3 Convergent angle θ i ((A) of Figure 38) is equal.Convergent angle θ i is angle by integrating rod 80Light be converted into angle of emergence θ out is angleLight.

Thus, in the exit facet 820 of the integrating rod 80 of taper, it is possible to recover causing due to angle of x direction Light loss.In embodiment 4, the light loss in x direction is identical with embodiment 3.

Below, the numerical example 3 of the convergence optical system 1D of embodiment 4 is illustrated.Table 16 illustrates The optical data of convergence optical system 1D.Figure 39 is the convergence optical system 1D of the optical data illustrating table 16 The figure of structure.(A) of Figure 39 be from x direction observe convergence optical system 1D figure, (B) of Figure 39 be from The figure of convergence optical system 1D is observed in y direction.

Convergence optical system 1D shown in Figure 39 by face illuminating source 11, collimating lens 713,813, collecting lens 117, assemble F value control lens 118 and integrating rod 8 is constituted.It addition, face illuminating source 11r, 11g, 11b system One is represented by the reference numeral 11.Light-emitting area 12r, 12g, 12b unification are represented by the reference numeral 12.1st collimating lens 713r, 713g, 713b are unified to be represented by label 713.2nd collimating lens 813r, 813g, 813b is unified by label 813 Represent.

In the present embodiment, light-emitting area 12r, the size of 12g, 12b are 2.7mm × 2.0mm.The integrating rod of taper The size of the plane of incidence 810 of 80 is 5.64mm × 2.86mm.The size of exit facet 820 is 6.39mm × 2.86mm.

If the convergent angle θ i of the light in the x direction in the plane of incidence 810 is 33 degree.In order to make the x in exit facet 820 The maximum injection angle of the light in direction is 30 degree, if coning angle β is 1.5 degree.From face illuminating source 11r, 11g, The angle θ s that is taken into of the light of 11b is 80 degree.Allow that angle of emergence α is 30 degree.In the case of Gai, F value be 1 (F value=1). This is equivalent to shine the region of the 15.97mm × 7.16mm of the display surface 23 of image-displaying member 22 with F2.5 Bright.Illumination angle θ l now is about 11.5 degree.The refractive index of the glass material that optics uses is 1.52.Light Department of the Chinese Academy of Sciences's part be collimating lens 713,813, collecting lens 117, assemble F value control lens 118 and integrating rod 80. About above specification, in addition to the size of the plane of incidence 810 and taper of integrating rod 80, with embodiment 3 institute The numerical example 2 shown is identical with comparative example 2.

[table 16]

The token of table 16 is identical with table 9.In table 16, face numbering S6, S7, S8 are aspherical shape.Table 17 Aspherical surface data is shown.

[table 17]

Face is numbered	S6	S7	S8
				k	-6.35283E-01	-4.77735E-01	8.7996262E+01
A1	0	0	0
				A2	0	0	0
A3	0	0	0
				A4	-1.456217E-05	-2.095716E-05	-1.836535E-05
A5	0	0	0
				A6	-2.039454E-08	-9.307053E-09	-1.836535E-05
A7	0	0	0
				A8	4.992894E-11	-8.546372E-12	1.464997E-11
A9	0	0	0
				A10	5.807781E-14	7.003542E-15	-1.243467E-14

Further, in table 16, face numbering S9, S10 become aspheric surface i.e. torus shape.Table 18 illustrates aspheric surface number According to.

[table 18]

Face is numbered	S9	S10
			k	4.7093293E+01	2.88027E-01
A1	0	0
			A2	0	0
A3	0	0
			A4	-5.643138E-07	1.027712E-06
A5	0	0
			A8	-1.046705E-08	7.358924E-08
A7	0	0
			A8	2.767020E-11	-2.622489E-11
A9	0	0
			A10	4.351870E-15	-4.912893E-13

Figure 40 is the figure of the analog result illustrating the convergent point on the plane of incidence 810.Quadrilateral frame in Figure 40 illustrate into Penetrate the scope in face 81.Transverse axis is x-axis, and the right direction of transverse axis is+x direction.The longitudinal axis is y-axis, the upper direction of the longitudinal axis For+y direction.It addition, in Figure 40, representative is from 3 kinds of wavelength of face illuminating source 11r, 11g, 11b injection Light (red light, green light, blue light) and the convergent point of the light of wavelength 550nm is shown.

Convergent point is by the light that radiates from the corner of light-emitting area 12r, 12g, 12b, from light-emitting area 12r, 12g, 12b The light of center radiation and the light radiated from the midpoint on light-emitting area 12r, each limit of 12g, 12b are formed.Shown in Figure 40 The zone of convergence of convergent point narrower than the zone of convergence of the convergent point shown in Figure 31 of numerical example 2.

Table 19 illustrates the F value in x direction when being focused on the plane of incidence 810 of integrating rod 80 and the F value in y direction. The radial location of light is position P1～P9 that Figure 32 defines.In y-direction, convergent angle θ i is the closer to the plane of incidence The center of 810 is the least.Therefore, in table 19, exist the closer to light-emitting area 12r, 12g, 12b y direction in , there is the edge then F value the closer to light-emitting area 12r, the y direction of 12g, 12b the least in the heart tendency that then F value is the biggest Tendency.Further, in the x direction, F value is less than 1 so that convergent angle θ i is more than 30 degree.

[table 19]

The radial location of light	The convergence F value in y direction	The convergence F value in x direction
			P1	0.810	0.921
P2	0.812	0.927
			P3	0.810	0.921
P4	0.810	0.920
			P5	0.812	0.926
P6	0.810	0.920
			P7	0.751	0.918
P8	0.748	0.924
			P9	0.751	0.918

Figure 41 is the x side in the dependence of angle of the light illustrating the x direction in the plane of incidence 810 and exit facet 820 To the figure of dependence of angle of light.Transverse axis illustrates the angle (spending) of light.The longitudinal axis illustrates light intensity (a.u.). Dotted line represents the distribution of the incidence angle θ in of the light in the plane of incidence 810.Solid line represents the injection of the light in exit facet 820 The distribution of angle θ out.In the plane of incidence 810, incident illumination comprises the incidence angle θ in light more than 30 degree.But, In exit facet 820, major part light has the angular distribution within 30 degree.It is illustrated based on the integrating rod 80 of taper and real The effectiveness of the angular transition of existing light.

Table 20 is the table illustrating the convergence efficiency on the plane of incidence 820 of comparative example 3 and numerical example 3.At table 20 In, allow that incident angle α is 30 degree.It addition, the integrating rod of comparative example 3 has the taper with numerical example 3 The length that integrating rod 80 is identical, does not have taper.The convergence efficiency of comparative example 3 is 69.94%.On the other hand, number The convergence efficiency of value embodiment 3 is 80.20%.Compared with comparative example 3, the convergence efficiency of numerical example 3 improves 14.67%.Relative efficiency is to set comparative example as the convergence efficiency (light utilization ratio) in the case of 100%.

It addition, suitably determine the size of integrating rod 80 according to light-emitting area 12r, the size of 12g, 12b and illumination F value. Thus, it is believed that the light inciding integrating rod 80 arrives screen 25, except illuminating the transmission loss of surplus, lens etc. Beyond the loss in image-displaying member 22, there is no light loss in principle.

[table 20]

Project	Comparative example 3	Numerical example 3
			Convergence efficiency (allowing angle of incidence 30 degree) on the plane of incidence of integrating rod	69.94%	80.20%
Relative efficiency (comparative example=100%)	100%	114.67%

As described above, in the convergence optical system 1D of embodiment 4, at the compression direction of length-width ratio On, make the convergent angle θ i of central part of the plane of incidence 810 less than the convergent angle θ i of edge of the plane of incidence 810.Thus, Even if in the case of the length-width ratio of light-emitting area 12r, 12g, 12b is different with the length-width ratio of image-displaying member 22, Convergence optical system 1D also is able to reduce light loss.As a result of which it is, use the projection of convergence optical system 1D Image display device 2D can reduce light loss.

In addition, integrating rod 80 increases the convergent angle θ i in the direction vertical with the compression direction of length-width ratio.Thus, The imaging multiplying power that image is all can be reduced.Further, it is possible to reduce further the compression direction of length-width ratio due to area And the light loss caused.

Here, with the increase of the convergent angle θ i in the direction vertical with the compression direction of length-width ratio, at the plane of incidence 810 In the vertical direction of the compression direction with length-width ratio on, produce the light loss caused due to angle.By making light Line, transmitted through the integrating rod 80 of taper, recovers this light loss caused due to angle.Integrating rod 80 in taper Exit facet 820 in, it is possible to reduce all light loss.And, convergence optical system 1D is capable of higher Light utilization ratio.

It is explained above embodiments of the present invention 1～4, but, each embodiment can suitably deform.Example As, in the respective embodiments described above, make green face illuminating source 11g opposed with collecting lens 4.Further, by red Color face illuminating source 11r is arranged on the direction vertical with green face illuminating source 11g.Further, blueness is used Face illuminating source 11b is arranged on the direction vertical with green face illuminating source 11g.But, the invention is not restricted to This form.

For example, it is possible to make blueness face illuminating source 11b opposed with collecting lens 4.In the case of Gai, can be by redness It is arranged on the direction vertical with blueness face illuminating source 11b with face illuminating source 11r.And it is possible to by green It is arranged on the direction vertical with blueness face illuminating source 11b with face illuminating source 11g.

Or, redness face illuminating source 11r can be made opposed with collecting lens 4.In the case of Gai, can be by green It is arranged on the direction vertical with redness face illuminating source 11r with face illuminating source 11g.And it is possible to by blueness It is arranged on the direction vertical with redness face illuminating source 11r with face illuminating source 11b.

Further, in the respective embodiments described above, collimating lens 13r, 13g, 13b show as 1 piece of lens respectively.And And, collecting lens 4 shows as 1 piece of lens.Further, collimating lens 13r, 13g, 13b are not limited to spherical lens, Non-spherical lens and free-form surface lens etc. can also be used.Further, collecting lens 4 is not limited to spherical lens, it is possible to To use non-spherical lens and free-form surface lens etc..

Further, in above-mentioned embodiment 3,4, if assemble F value controlling lens 5 is that 1 piece of lens illustrates, But it is not limited to this form.For example, it is possible to be such as taken into angle θ s and multiplying power according to the specification of convergence optical system 1C Deng, use the lens of more than 2 pieces to constitute.Further, assemble F value control lens 5 and be not limited to spherical lens, it is also possible to Use non-spherical lens and free-form surface lens etc..

And then, in above-mentioned embodiment 1,3,4, illustrate to use integrating rod 8 as light intensity distributions homogenization The situation of element.It is however not limited to integrating rod, it is possible to use other light intensity distributions homogenization such as the session of hollow Element.

Further, in the respective embodiments described above, if the light radiated from face illuminating source 11r, 11g, 11b is closed The unit become is dichroic mirror.It is however not limited to dichroic mirror, it is possible to use other light compositing unit such as Amici prism.

Further, in the respective embodiments described above, if face illuminating source 11r, 11g, 11b are red, green and blue These 3 kinds of colors.But it is not limited to this, it is possible to use by the face illuminating source more than 4 kinds of colors constituted.Further, For example, it is also possible to use by cyan and the red face illuminating source waiting 2 kinds of colors to constitute.And it is also possible to use it is white The face illuminating source of color.In the case of need not multicolor displaying, it is possible to use monochromatic face illuminating source.

The present invention can be applied to the convergence optical system of use face illuminating source and use this convergence optical system Projection display device.

Label declaration

1A, 1B, 1C, 1D: convergence optical system；2A, 2B, 2C, 2D: projection display device；4、 114,117,214: collecting lens (convergent component)；5,118: assemble F value and control lens (convergent component)； 50,115: toric lens；51: the 1；52: the 2；6,7: dichroic mirror (light compositing unit)；8: Integrating rod (light intensity distributions uniformization element)；81: the plane of incidence of integrating rod；82: the exit facet of integrating rod；11、 11r, 11g, 11b: face illuminating source；12,12r, 12g, 12b: the light-emitting area of face illuminating source；13、13r、 13g, 13b, 113,213,313,513,613,713,813: collimating lens (collimating optical system)；20、 21: lamp optical system；22: image-displaying member；23: the display surface of image-displaying member；24: projection optics System；25: screen；The area of As: light-emitting area；The area of Ai: the plane of incidence；Al: display surface area；θ s: take Enter angle；θ i: convergent angle；θ l: illumination angle；α: allow angle of incidence；θ in: angle of incidence；θ out: angle of emergence； Angle；Es: the propagation of face illuminating source；The propagation of Ei: integrating rod；The expansion of El: image-displaying member Zhan Liang；B, B1, B2: zone of convergence；P1, P2, P3, P4, P5, P6, P7, P8, P9: radial location； β: coning angle.

Claims

1. a convergence optical system, it is characterised in that this convergence optical system has:

Face illuminating source (11r, 11g, 11b), it has light-emitting area (12r, 12g, 12b), from described light-emitting area (12r, 12g, 12b) radiating light；

There is the collimating optical system (13r, 13g, 13b) of positive refractive power, its will from described light-emitting area (12r, 12g, Light 12b) radiated is converted into almost parallel light；

Having the convergent component (4) of positive refractive power, it assembles the light being converted into almost parallel light；And

Light intensity distributions uniformization element (8), it has incident entering by the light after described convergent component (4) convergence Penetrate face (81), the light intensity distributions of incident illumination carried out homogenization and penetrates from exit facet (82),

In light on the described plane of incidence (81) converging at described light intensity distributions uniformization element (8), assemble Convergent angle in the light of the central part of the described plane of incidence (81) is less than the light in the corner converging at the described plane of incidence (81) Convergent angle.

2. a convergence optical system, it is characterised in that this convergence optical system has:

Light on by the described plane of incidence (81) converging at described light intensity distributions uniformization element (8) is formed In luminous point, it is formed at the luminous point of central part of the described plane of incidence (81) more than the angle being formed at the described plane of incidence (81) The luminous point in portion.

3. a convergence optical system, it is characterised in that this convergence optical system has:

Radiate from the described light-emitting area (12r, 12g, 12b) of described illuminating source (11r, 11g, 11b) In light, compared with the light radiated from the corner of described light-emitting area (12r, 12g, 12b), from described light-emitting area (12r, 12g, 12b) central part radiation light be focused at the position farther away from described convergent component (4).

4. a convergence optical system, it is characterised in that this convergence optical system has:

Compared with the corner of the light-emitting area (12r, 12g, 12b) of described illuminating source (11r, 11g, 11b), The described light-emitting area (12r, 12g, 12b) of described illuminating source (11r, 11g, 11b) is divided in described light intensity The imaging multiplying power of the upper imaging of the described plane of incidence (81) of cloth uniformization element (8) is bigger at central part.

Convergence optical system the most according to claim 1, it is characterised in that constitute described convergence optical system (1A) at least one lens of described convergent component (4) have a following optical surface (42): with from described luminescence The light of the central part radiation in face (12r, 12g, 12b) is compared, and assembles from described luminous light with higher refractive power The light of the corner radiation of the described light-emitting area (12r, 12g, 12b) in source (11r, 11g, 11b).

Convergence optical system the most according to claim 5, it is characterised in that in described optical surface (42), Mainly act on described light-emitting area (12r, 12g, 12b) from described illuminating source (11r, 11g, 11b) The refractive power of part (42a) of the light of central part radiation, less than mainly act on from described illuminating source (11r, 11g, 11b) the refractive power of part (42b) of light of corner radiation of described light-emitting area (12r, 12g, 12b).

Convergence optical system the most according to claim 5, it is characterised in that in described optical surface (42), Mainly act on described light-emitting area (12r, 12g, 12b) from described illuminating source (11r, 11g, 11b) The part (42a) of light of central part radiation in concave, mainly act on from described illuminating source (11r, 11g, The part (42b) of the light of the corner radiation of described light-emitting area (12r, 12g, 12b) 11b) is in convex shape.

8. a convergence optical system, it is characterised in that this convergence optical system has:

There is the collimating optical system (13r, 13g, 13b) of positive refractive power, its will from described light-emitting area (12r, 12g, Light 12b) radiated is converted into almost parallel light；And

Having the convergent component (4) of positive refractive power, it is first that the light being converted into almost parallel light is converged to image display by it The display surface (23) of part (22),

In light on the described display surface (23) converging at described image-displaying member (22), converge at described aobvious Show that the convergent angle of the light of the central part in face (23) is less than the convergent angle of the light converging at corner.

9. a convergence optical system, it is characterised in that this convergence optical system has:

In the luminous point that light on by the described display surface (23) converging at described image-displaying member (22) is formed, The luminous point of the central part being formed at described display surface (23) is more than the luminous point in the corner being formed at described display surface (23).

10. a convergence optical system, it is characterised in that this convergence optical system has:

11. 1 kinds of convergence optical systems, it is characterised in that this convergence optical system has:

Face illuminating source (11r, 11g, 11b), it has light-emitting area (12r, 12g, 12b), from light-emitting area (12r, 12g, 12b) radiating light；

Image-displaying member (22), its have incident assembled by described convergent component (4) after the display surface (23) of light,

Compared with the corner of the light-emitting area (12r, 12g, 12b) of described illuminating source (11r, 11g, 11b), The described light-emitting area (12r, 12g, 12b) of described illuminating source (11r, 11g, 11b) shows at described image The imaging multiplying power of the upper imaging of the described display surface (23) of element (22) is bigger at central part.

12. convergence optical systems according to claim 8, it is characterised in that constitute described convergence optical system (1A) at least one lens of described convergent component (4) have a following optical surface (42): with from described luminescence The light of the central part radiation in face (12r, 12g, 12b) is compared, and assembles from described luminous light with higher refractive power The light of the corner radiation of the described light-emitting area (12r, 12g, 12b) in source (11r, 11g, 11b).

13. convergence optical systems according to claim 12, it is characterised in that in described optical surface (42) In, mainly act on the described light-emitting area (12r, 12g, 12b) from described illuminating source (11r, 11g, 11b) The refractive power of part (42a) of light of central part radiation, less than mainly act on from described illuminating source (11r, 11g, 11b) the refractive power of part (42b) of light of corner radiation of described light-emitting area (12r, 12g, 12b).

14. convergence optical systems according to claim 12, it is characterised in that in described optical surface (42) In, mainly act on the described light-emitting area (12r, 12g, 12b) from described illuminating source (11r, 11g, 11b) The part (42a) of light of central part radiation in concave, mainly act on from described illuminating source (11r, 11g, 11b) the part (42b) of light of corner radiation of described light-emitting area (12r, 12g, 12b) in convex Shape.

15. 1 kinds of convergence optical systems, it is characterised in that this convergence optical system has:

Having the convergent component (5) of positive refractive power, it has the anchor ring (51,52) of more than 2, assembles and is changed Become the light of described almost parallel light；And

Light intensity distributions uniformization element (8), it has incident entering by the light after described convergent component (5) convergence Penetrate face (81), the light intensity distributions of incident illumination carried out homogenization and penetrates from exit facet (82),

The length-width ratio of described light-emitting area (12r, 12g, 12b) is different from the length-width ratio of the described plane of incidence (81),

In the light of the compression direction of the length-width ratio converged on the described plane of incidence (81), converge at the described plane of incidence (81) The convergent angle of light of central part of compression direction of length-width ratio less than the edge of the compression direction converging at length-width ratio The convergent angle of light.

16. convergence optical systems according to claim 15, it is characterised in that converging at the described plane of incidence (81), in the light of the compression direction of the length-width ratio on, the compression direction of the length-width ratio of the described plane of incidence (81) is converged at The luminous point of central part more than the luminous point of edge of the compression direction converging at length-width ratio.

17. convergence optical systems according to claim 15, it is characterised in that with from described light-emitting area (12r, 12g, 12b) the converged position of light of edge radiation of compression direction of length-width ratio compare, from described light-emitting area (12r, 12g, 12b) the converged position of light of central authorities' radiation of compression direction of length-width ratio farther away from described convergent component (4)。

18. convergence optical systems according to claim 15, it is characterised in that described convergent component (5) The optical surface (51,52) of more than at least 2 has anchor ring, and from described light-emitting area (12r, 12g, 12b) The light of the compression direction of the length-width ratio of the central part radiation of the compression direction of length-width ratio is compared, and assembles with higher refractive power Compression side from the length-width ratio of the edge of the compression direction of the length-width ratio of described light-emitting area (12r, 12g, 12b) radiation To light.

19. convergence optical systems according to claim 15, it is characterised in that described light intensity distributions is uniform Change element (8) and there is the area taper less than the area of described exit facet (820) of the described plane of incidence (810), The angle of emergence of the light penetrated from described exit facet (820) is less than the convergent angle of the light converging at the described plane of incidence (810).

20. 1 kinds of projection display devices, it is characterised in that this projection display device has:

The convergence optical system (1A, 1B, 1C, 1D) described in any one in claim 1～19；

Image-displaying member (22), the light that its incidence is penetrated from described convergence optical system, incident illumination is modulated And generate image light；And

Projection optical system (24), described image-displaying member (22) image light generated is amplified throwing by it Shadow.